trioxide vs ratsbane

trioxide and ratsbane both are nouns.

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

As nouns, ratsbane is a hyponym of trioxide; that is, ratsbane is a word with a more specific, narrower meaning than trioxide:

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

Other hyponyms of trioxide include arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic.

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