clerk vs file clerk

clerk and file clerk both are nouns.

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

As nouns, file clerk is a hyponym of clerk; that is, file clerk is a word with a more specific, narrower meaning than clerk:

clerk: an employee who performs clerical work (e.g., keeps records or accounts)
file clerk: a clerk who is employed to maintain the files of an organization

clerk (noun)	file clerk (noun)
an employee who performs clerical work (e.g., keeps records or accounts)	a clerk who is employed to maintain the files of an organization
a salesperson in a store

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