barium dioxide vs barium peroxide

barium dioxide and barium peroxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
barium dioxide	Yes	No	No	No
barium peroxide	Yes	No	No	No

As nouns, barium dioxide and barium peroxide are synonyms defined as:

barium dioxide and barium peroxide: a white toxic powder obtained by heating barium oxide in air

barium dioxide (noun)	barium peroxide (noun)
a white toxic powder obtained by heating barium oxide in air	a white toxic powder obtained by heating barium oxide in air