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