a chef d'oeuvre

(formal)

an artist's or writer's best piece of work The Decameron is widely regarded as Boccaccio's chef d'oeuvre.

Name	Pronounced	Usage
Nathanael	nay-THAN-ee-əl (English), nay-THAN-yəl (English)	Biblical, Biblical Greek
Franziska	frahn-TSIS-kah	German
Cathaoir	KA-heer	Irish
Ara	-	Armenian, Armenian Mythology
Alisha	ə-LISH-ə, ə-LEE-shə	English
Rava	RAH-vah	Esperanto