WikiRhymer has about 300 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 35 (Add to/Edit Set Members)
            payback
              playback
                way back
                  pay back
                    lay back
                      End Rhyme Set #2 of 35 (Add to/Edit Set Members)
                      haystack
                        hay stack
                          • like looking for a needle in a haystack
                          • look for a needle in a haystack
                          • needle in a haystack
                          End Rhyme Set #3 of 35 (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)
                          payback
                            playback
                              way back
                                pay back
                                  lay back
                                    Near Rhyme Set #1 of 3 (Add to/Edit Set Members)
                                    haystack
                                      hay stack
                                        • like looking for a needle in a haystack
                                        • look for a needle in a haystack
                                        • needle in a haystack
                                        Near Rhyme Set #2 of 3 (Add to/Edit Set Members)
                                        came back
                                          laid back
                                            shake back
                                              racetrack
                                                paperback
                                                  razorback
                                                    cable back
                                                      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 "maniac".

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