jean vs denim

jean and denim both are nouns.

Word	Noun	Adjective	Verb	Adverb
jean	Yes	No	No	No
denim	Yes	No	No	No

As nouns, jean and denim are synonyms defined as:

Other synonyms of jean include dungaree.

jean (noun)	denim (noun)
a coarse durable twill-weave cotton fabric	a coarse durable twill-weave cotton fabric
	(used in the plural) close-fitting trousers of heavy denim for manual work or casual wear