clock vs timekeeper

clock and timekeeper both are nouns.

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

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

Other hypernyms of clock include horologe, timepiece.

clock (noun)	timekeeper (noun)
a timepiece that shows the time of day	a measuring instrument or device for keeping time
	a clerk who keeps track of the hours worked by employees
	(sports) an official who keeps track of the time elapsed

clock (verb)	timekeeper (verb)
measure the time or duration of an event or action or the person who performs an action in a certain period of time