electromagnetism vs electromagnetic

electromagnetism is a noun but electromagnetic is not a noun.

Word	Noun	Adjective	Verb	Adverb
electromagnetism	Yes	No	No	No
electromagnetic	No	Yes	No	No

electromagnetism (noun)	electromagnetic (noun)
the branch of physics concerned with electromagnetic phenomena
magnetism produced by an electric current

electromagnetism (adjective)	electromagnetic (adjective)
	pertaining to or exhibiting magnetism produced by electric charge in motion