levis vs denim

levis and denim both are nouns.

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

As nouns, denim is a hypernym of levis; that is, denim is a word with a broader meaning than levis:

levis: a popular brand of jeans
denim: (used in the plural) close-fitting trousers of heavy denim for manual work or casual wear

Other hypernyms of levis include blue jeans, jeans.

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