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