rariora vs showpiece

rariora and showpiece both are nouns.

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

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

rariora: (plural) rare collector's items
showpiece: the outstanding item (the prize piece or main exhibit) in a collection

Other hypernyms of rariora include collector's item, piece de resistance.

rariora (noun)	showpiece (noun)
(plural) rare collector's items	the outstanding item (the prize piece or main exhibit) in a collection