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