showpiece vs oddment

showpiece and oddment both are nouns.

Word	Noun	Adjective	Verb	Adverb
showpiece	Yes	No	No	No
oddment	Yes	No	No	No

As nouns, oddment is a hypernym of showpiece; that is, oddment is a word with a broader meaning than showpiece:

showpiece: the outstanding item (the prize piece or main exhibit) in a collection
oddment: something unusual -- perhaps worthy of collecting

Other hypernyms of showpiece include curio, curiosity, oddity, peculiarity, rarity.

showpiece (noun)	oddment (noun)
the outstanding item (the prize piece or main exhibit) in a collection	a piece of cloth that is left over after the rest has been used or sold
	something unusual -- perhaps worthy of collecting