denim vs levis

denim and levis both are nouns.

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

As nouns, levis is a hyponym of denim; that is, levis is a word with a more specific, narrower meaning than denim:

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

Other hyponyms of denim include Levi's, distressed jeans.

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