arsenic trioxide vs white arsenic

arsenic trioxide and white arsenic both are nouns.

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

As nouns, arsenic trioxide and white arsenic are synonyms defined as:

arsenic trioxide and white arsenic: a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer

Other synonyms of arsenic trioxide include arsenic, arsenous anhydride, arsenous oxide, ratsbane.

arsenic trioxide (noun)	white arsenic (noun)
a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer	a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer