Saracen vs Moslem

Saracen and Moslem both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saracen	Yes	No	No	No
Moslem	Yes	Yes	No	No

As nouns, Moslem is a hypernym of Saracen; that is, Moslem is a word with a broader meaning than Saracen:

Other hypernyms of Saracen include Muslim.

Saracen (noun)	Moslem (noun)
(when used broadly) any Arab	a believer in or follower of Islam
(historically) a member of the nomadic people of the Syrian and Arabian deserts at the time of the Roman Empire
(historically) a Muslim who opposed the Crusades

Saracen (adjective)	Moslem (adjective)
	of or relating to or supporting Islamism