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