philosopher's wool vs zinc oxide

philosopher's wool and zinc oxide both are nouns.

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

As nouns, philosopher's wool and zinc oxide are synonyms defined as:

philosopher's wool and zinc oxide: oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment

Other synonyms of philosopher's wool include flowers of zinc, philosophers' wool.

philosopher's wool (noun)	zinc oxide (noun)
oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment	oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment