ratsbane vs arsenic trioxide

ratsbane and arsenic trioxide both are nouns.

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

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

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

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

ratsbane (noun)	arsenic trioxide (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