arsenic trioxide vs trioxide

arsenic trioxide and trioxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
arsenic trioxide	Yes	No	No	No
trioxide	Yes	No	No	No

As nouns, trioxide is a hypernym of arsenic trioxide; that is, trioxide is a word with a broader meaning than arsenic trioxide:

arsenic trioxide: a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
trioxide: an oxide containing three atoms of oxygen in the molecule

arsenic trioxide (noun)	trioxide (noun)
a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer	an oxide containing three atoms of oxygen in the molecule