clerk vs filer

clerk and filer both are nouns.

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

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

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

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

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