centerpiece vs epergne

centerpiece and epergne both are nouns.

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

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

centerpiece: 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

centerpiece (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