WikiRhymer has about 200 rhyming words and phrases for "foolish" starting with...

ghoulish
    Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
    Words that have a pure rhyme on their last syllable only.
    bluish
      newish
        Jewish
          End Rhyme Set #1 of 40 (Add to/Edit Set Members)
          jewfish
            blue fish
              End Rhyme Set #2 of 40 (Add to/Edit Set Members)
              goldfish
                gold fish
                  End Rhyme Set #3 of 40 (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)
                  bluish
                    newish
                      Jewish
                        Near Rhyme Set #1 of 3 (Add to/Edit Set Members)
                        jewfish
                          blue fish
                            Near Rhyme Set #2 of 3 (Add to/Edit Set Members)
                            prudish
                              goosefish
                                brutish
                                  tuna fish
                                    Near Rhyme Set #3 of 3 * (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."

                                    We have no mosaic rhymes for "foolish".

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