philosopher's wool vs oxide

philosopher's wool and oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
philosopher's wool	Yes	No	No	No
oxide	Yes	No	No	No

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

philosopher's 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

philosopher's 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