centrepiece vs epergne

centrepiece and epergne both are nouns.

Word	Noun	Adjective	Verb	Adverb
centrepiece	Yes	No	No	No
epergne	Yes	No	No	No

As nouns, epergne is a hyponym of centrepiece; that is, epergne is a word with a more specific, narrower meaning than centrepiece:

centrepiece: something placed at the center of something else (as on a table)
epergne: a large table centerpiece with branching holders for fruit or sweets or flowers

centrepiece (noun)	epergne (noun)
something placed at the center of something else (as on a table)	a large table centerpiece with branching holders for fruit or sweets or flowers
the central or most important feature