timekeeper vs clerk

timekeeper and clerk both are nouns.

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

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

timekeeper: a clerk who keeps track of the hours worked by employees
clerk: an employee who performs clerical work (e.g., keeps records or accounts)

timekeeper (noun)	clerk (noun)
a measuring instrument or device for keeping time	an employee who performs clerical work (e.g., keeps records or accounts)
a clerk who keeps track of the hours worked by employees	a salesperson in a store
(sports) an official who keeps track of the time elapsed

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