jeans vs levis

jeans and levis both are nouns.

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

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

jeans: (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 jeans include Levi's, distressed jeans.

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