penpusher vs clerk

penpusher and clerk both are nouns.

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

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

penpusher: a clerk who does boring paperwork
clerk: an employee who performs clerical work (e.g., keeps records or accounts)

penpusher (noun)	clerk (noun)
a clerk who does boring paperwork	an employee who performs clerical work (e.g., keeps records or accounts)
	a salesperson in a store

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