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