zinc oxide vs philosophers' wool

zinc oxide and philosophers' wool both are nouns.

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

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

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

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

zinc oxide (noun)	philosophers' wool (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