timekeeper vs clock

timekeeper and clock both are nouns.

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

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

Other hyponyms of timekeeper include atomic clock, sandglass, sundial, timer, ticker, watch.

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

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