WR has about 300 rhymes 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 16 (Add to/Edit Set Members)
            payback
              playback
                End Rhyme Set #2 of 16 (Add to/Edit Set Members)
                greenback
                  lean back
                    End Rhyme Set #3 of 16 (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
                        Near Rhyme Set #1 of 2 (Add to/Edit Set Members)
                        haystack
                          racetrack
                            paperback
                              razorback
                                • like looking for a needle in a haystack
                                • look for a needle in a haystack
                                • needle in a haystack
                                Near Rhyme Set #2 of 2 * (Add to/Edit Set Members)
                                Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."
                                • grainy + black
                                • Janie + back
                                Mosaic Rhyme Set #1 of 1 (Add to/Edit Set Members)