bric-a-brac vs oddment

bric-a-brac and oddment both are nouns.

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

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

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

bric-a-brac (noun)	oddment (noun)
miscellaneous curios	a piece of cloth that is left over after the rest has been used or sold
	something unusual -- perhaps worthy of collecting