jeans vs workwear

jeans and workwear both are nouns.

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

As nouns, workwear is a hypernym of jeans; that is, workwear is a word with a broader meaning than jeans:

jeans: (used in the plural) close-fitting trousers of heavy denim for manual work or casual wear
workwear: heavy-duty clothes for manual or physical work

Other hypernyms of jeans include pair of trousers, pant, trousers.

jeans (noun)	workwear (noun)
(used in the plural) close-fitting trousers of heavy denim for manual work or casual wear	heavy-duty clothes for manual or physical work