salesclerk vs salesperson

salesclerk and salesperson both are nouns.

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

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

salesclerk: 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 salesclerk include sales rep, sales representative.

salesclerk (noun)	salesperson (noun)
a salesperson in a store	a person employed to represent a business and to sell its merchandise (as to customers in a store or to customers who are visited)