filer vs clerk

filer and clerk both are nouns.

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

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

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

filer (noun)	clerk (noun)
a party who files a notice with a law court	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

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