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