clerk vs filing clerk

clerk and filing clerk both are nouns.

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

As nouns, filing clerk is a hyponym of clerk; that is, filing 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)
filing clerk: a clerk who is employed to maintain the files of an organization

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