WikiRhymer has about 400 rhyming words and phrases for "maniac" starting with...

egomaniac
    nymphomaniac
      megalomaniac
        Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
        Words that have a pure rhyme on their last syllable only.
        amnesiac
          aphrodisiac
            End Rhyme Set #1 of 49 (Add to/Edit Set Members)
            payback
              playback
                way back
                  pay back
                    lay back
                      End Rhyme Set #2 of 49 (Add to/Edit Set Members)
                      came back
                        game back
                          End Rhyme Set #3 of 49 (Add to/Edit Set Members)

                          Get Pro Features!

                          To see all the end rhymes sets, you must "Go Pro." It's only $7.00 a year!

                          I want to "Go Pro"

                          Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely. (Click for more info)
                          payback
                            playback
                              way back
                                pay back
                                  lay back
                                    Near Rhyme Set #1 of 6 (Add to/Edit Set Members)
                                    came back
                                      game back
                                        Near Rhyme Set #2 of 6 (Add to/Edit Set Members)
                                        shake back
                                          take back
                                            Near Rhyme Set #3 of 6 (Add to/Edit Set Members)

                                            Get Pro Features!

                                            To see all the near rhymes sets, you must "Go Pro." It's only $7.00 a year!

                                            I want to "Go Pro"

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

                                            We have no mosaic rhymes for "maniac".

                                            Mosaic Rhyme Set #1 of 1 (Add to/Edit Set Members)