clerk vs salesperson

clerk and salesperson both are nouns.

Word	Noun	Adjective	Verb	Adverb
clerk	Yes	No	Yes	No
salesperson	Yes	No	No	No

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

clerk: a salesperson in a store
salesperson: 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 rep, sales representative.

clerk (noun)	salesperson (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)	salesperson (verb)
work as a clerk, as in the legal business