bric-a-brac vs curio

bric-a-brac and curio both are nouns.

Word	Noun	Adjective	Verb	Adverb
bric-a-brac	Yes	No	No	No
curio	Yes	No	No	No

As nouns, curio is a hypernym of bric-a-brac; that is, curio is a word with a broader meaning than bric-a-brac:

Other hypernyms of bric-a-brac include curiosity, oddity, oddment, peculiarity, rarity.

bric-a-brac (noun)	curio (noun)
miscellaneous curios	something unusual -- perhaps worthy of collecting