bric-a-brac vs peculiarity

bric-a-brac and peculiarity both are nouns.

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

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

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

bric-a-brac (noun)	peculiarity (noun)
miscellaneous curios	something unusual -- perhaps worthy of collecting
	a distinguishing trait
	an odd or unusual characteristic