philosophers' wool vs oxide

philosophers' wool and oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
philosophers' wool	Yes	No	No	No
oxide	Yes	No	No	No

As nouns, oxide is a hypernym of philosophers' wool; that is, oxide is a word with a broader meaning than philosophers' wool:

philosophers' wool: oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment
oxide: any compound of oxygen with another element or a radical

philosophers' wool (noun)	oxide (noun)
oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment	any compound of oxygen with another element or a radical