clerk vs sales rep

clerk and sales rep both are nouns.

Word	Noun	Adjective	Verb	Adverb
clerk	Yes	No	Yes	No
sales rep	Yes	No	No	No

As nouns, sales rep is a hypernym of clerk; that is, sales rep is a word with a broader meaning than clerk:

clerk: a salesperson in a store
sales rep: a person employed to represent a business and to sell its merchandise (as to customers in a store or to customers who are visited)

Other hypernyms of clerk include sales representative, salesperson.

clerk (noun)	sales rep (noun)
an employee who performs clerical work (e.g., keeps records or accounts)	a person employed to represent a business and to sell its merchandise (as to customers in a store or to customers who are visited)
a salesperson in a store

clerk (verb)	sales rep (verb)
work as a clerk, as in the legal business