ratsbane vs trioxide

ratsbane and trioxide both are nouns.

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

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

ratsbane: 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

ratsbane (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