Here's what rhymes with niac.
back lack pack nach rack sac sack hack jack tack fac knack lac shack mac mak tak whack wrack yak mack wack yack black attack track crack stack plaque slack aback smack snack flak quack unpack clack claque flack anorak highjack maniac shellac ipecac repack thumbtack mudpack skyjack almanac elegiac zodiac gunnysack rickrack cardiac paperback demoniac hardtack haversack lumberjack piggyback amnesiac razorback pickaback counterattack insomniac applejack crackerjack quarterback stickleback steeplejack nymphomaniac megalomaniac Words that almost rhyme with niac
bag lag tag rag gag hag wag fag mag nag sag zag dag shag flag drag slag stag brag crag snag swag blag toerag dishrag fleabag scrag washrag nosebag chinwag wigwag scallywag sleazebag lollygag lallygag saddlebag scalawag bank task rank tank thank mask sank cask masque shank bask dank hanc lank talc hank yank basque blank drank flank flask frank crank plank shrank franc prank clank spank stank unmask swank embank outrank antitank riverbank databank pointblank charabanc