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
Rurik	-	Russian
Donalda	dah-NAWL-da	Scottish
Corinna	kə-REEN-ə (English), kə-RIN-ə (English), ko-RI-nah (German)	English, German, Ancient Greek (Latinized)
Folcher	-	Ancient Germanic
Cybill	SIB-əl	English (Rare)
Eleanore	EL-ə-nawr	English