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