masterwork

something (as a work of art) that is a great achievement and often its creator's greatest achievement his most famous novel is regarded as a masterwork of Western literature Synonyms chef d'oeuvre, classic, magnum opus, masterpieceRelated Words masterstroke, pièce de résistance, showpiece, tour de force; blockbuster, megahit, smash, success, winner; gem, jewel, prize, treasureNear Antonyms bomb, catastrophe, clunker, debacle (also débâcle), disaster, dud, failure, fiasco, fizzle, flop, loser, turkey, washout