WikiRhymer has about 700 rhyming words and phrases for "clown" starting with...

Words that have identical vowel-based rhyme sounds in the tonic syllable. Moreover, that tonic syllable must start with a different consonantal sound.
brown
    crown
      down
        downe
          drown
            frown
              gown
                lown
                  noun
                    town
                      around
                        downtown
                          facedown
                            renown
                              uptown
                                dumb down
                                  Browne
                                    Towne
                                      • boss one around
                                      • bum around
                                      • cast around
                                      • chase around
                                      • come around
                                      • every time one turns around
                                      • fiddle around
                                      • fool around
                                      • go around
                                      • hang around
                                      • have been around
                                      • horse around
                                      • kick around
                                      • knock around
                                      • learn one's way around
                                      • lie around
                                      • mess around
                                      • mill around
                                      • monkey around
                                      • nose around
                                      • pass around
                                      • play around
                                      • push around
                                      • roll around
                                      • run rings around
                                      • scout around
                                      • screw around
                                      • scrounge around
                                      • show around
                                      • skirt around
                                      • sleep around
                                      • stick around
                                      • tear around
                                      • the other way around
                                      • throw one's weight around
                                      • throw your weight around
                                      • what goes around comes around
                                      • year around
                                      • hanging around
                                      • hangin' around
                                      • do up brown
                                      • bear down
                                      • beat down
                                      • bog down
                                      • bogged down
                                      • boil down
                                      • break down
                                      • bring down
                                      • bring the house down
                                      • burn down
                                      • button down
                                      • calm down
                                      • cast down
                                      • catch with one's pants down
                                      • clamp down
                                      • come down
                                      • crack down
                                      • cut down
                                      • die down
                                      • dig down
                                      • dress down
                                      • dressing down
                                      • drink down
                                      • face down
                                      • flag down
                                      • garbage down
                                      • get one down
                                      • give one a dressing down
                                      • go down
                                      • hand down
                                      • hand me down
                                      • hands down
                                      • haul down
                                      • hold down
                                      • hunt down
                                      • jot down
                                      • keep down
                                      • kick down
                                      • knock down
                                      • knuckle down
                                      • lay down
                                      • let down
                                      • let your hair down
                                      • live down
                                      • mark down
                                      • nail down
                                      • narrow down
                                      • nose down
                                      • pare down
                                      • pay down
                                      • pin down
                                      • pipe down
                                      • play down
                                      • plunk down
                                      • pull down
                                      • put down
                                      • put one's foot down
                                      • put your foot down
                                      • rub down
                                      • run down
                                      • scale down
                                      • set down
                                      • settle down
                                      • shake down
                                      • shout down
                                      • shut down
                                      • simmer down
                                      • sit down
                                      • slap down
                                      • slow down
                                      • smooth down
                                      • step down
                                      • take down
                                      • take lying down
                                      • talk down
                                      • taper down
                                      • tear down
                                      • tie down
                                      • tone down
                                      • track down
                                      • turn down
                                      • turn thumbs down
                                      • upside down
                                      • water down
                                      • watered down
                                      • weight down
                                      • when the chips are down
                                      • win hands down
                                      • with one's pants down
                                      • dumbs down
                                      • dumb down
                                      • town and gown
                                      • hit town
                                      • man about town
                                      • on the town
                                      • out of town
                                      • out on the town
                                      • paint the town
                                      • talk of the town
                                      Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
                                      Words that have a pure rhyme on their last syllable only.
                                      breakdown
                                        shakedown
                                          • nervous breakdown
                                          End Rhyme Set #1 of 5 (Add to/Edit Set Members)
                                          knockdown
                                            lockdown
                                              End Rhyme Set #2 of 5 (Add to/Edit Set Members)
                                              godown
                                                hoedown
                                                  lowdown
                                                    showdown
                                                      slowdown
                                                        End Rhyme Set #3 of 5 (Add to/Edit Set Members)

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                                                        Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely. (Click for more info)
                                                        cowl
                                                          foul
                                                            fowl
                                                              growl
                                                                howl
                                                                  jowl
                                                                    moul
                                                                      owl
                                                                        prowl
                                                                          scowl
                                                                            soule
                                                                              towel
                                                                                afoul
                                                                                  Crowl
                                                                                    Raul
                                                                                      Sproul
                                                                                        • neither fish nor fowl
                                                                                        • neither fish, flesh, nor fowl
                                                                                        • cheek by jowl
                                                                                        • night owl
                                                                                        • throw in the towel
                                                                                        Near Rhyme Set #1 of 32 (Add to/Edit Set Members)
                                                                                        fouled
                                                                                          growled
                                                                                            howled
                                                                                              scowled
                                                                                                Near Rhyme Set #2 of 32 (Add to/Edit Set Members)
                                                                                                bowels
                                                                                                  fouls
                                                                                                    growls
                                                                                                      howls
                                                                                                        jowls
                                                                                                          owls
                                                                                                            towels
                                                                                                              vowels
                                                                                                                Near Rhyme Set #3 of 32 (Add to/Edit Set Members)

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                                                                                                                Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."

                                                                                                                No mosaic rhymes for one-syllable words.