bric-a-brac vs oddity

bric-a-brac and oddity both are nouns.

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

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

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

bric-a-brac (noun)	oddity (noun)
miscellaneous curios	something unusual -- perhaps worthy of collecting
	a strange attitude or habit
	eccentricity that is not easily explained