Here's what rhymes with toothdecay.
decay gay k kc cay they may day way away say pay re lay today j array bay clay gray grey ray che hay nay okay weigh ballet fay fe yea allay bouquet dey hey ley ok passe rei sei whey bk jay lei payee rea rj tae wei bey neigh parquet fey roue shay purvey soubriquet aweigh play stay delay survey essay obey pray prey spray cafe stray sway tray fray oj slay valet attache fillet ij sleigh bj drei fj tj toothache tre zwei bray dray flay sobriquet soiree belay brae hideaway splay moray sachet stowaway toupee trey aurae briquet hurray spay copay display convey yesterday holiday betray dismay halfway repay astray underway vertebrae cliche defray disarray disobey faraway overlay papillae protege waterway cabaret dossier emigre francais gangway puree saute underlay crochet croquet fistulae getaway risque souffle castaway fibulae filet inveigh throwaway byplay nisei patellae prepay sorbet stingray flyaway hooray noway overpay sickbay urethrae layaway medullae outplay outstay reweigh umbrae underpay uvulae cybercafe foldaway tearaway anyway everyday interplay portray runaway lamellae passageway sequelae matinee naturae nebulae replay alleyway breakaway maxillae scapulae straightaway wordplay workaday caraway giveaway ricochet airplay pleurae resurvey takeaway underplay overplay overstay caesurae bobsleigh copulae misplay respray formulae naivete microarray societe lingerie carriageway macrame roundelay penumbrae walkaway communique trabeculae cabriolet salmonellae tarantulae companionway caravanserais