clerk vs employee

clerk and employee both are nouns.

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

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

clerk: an employee who performs clerical work (e.g., keeps records or accounts)
employee: a worker who is hired to perform a job

clerk (noun)	employee (noun)
an employee who performs clerical work (e.g., keeps records or accounts)	a worker who is hired to perform a job
a salesperson in a store

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