Islam vs Muslim

Islam and Muslim both are nouns.

Word	Noun	Adjective	Verb	Adverb
Islam	Yes	No	No	No
Muslim	Yes	Yes	No	No

Islam (noun)	Muslim (noun)
the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran	a believer in or follower of Islam
the civilization of Muslims collectively which is governed by the Muslim religion

Islam (adjective)	Muslim (adjective)
	of or relating to or supporting Islamism