balance wheel vs timekeeper

balance wheel and timekeeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
balance wheel	Yes	No	No	No
timekeeper	Yes	No	No	No

balance wheel (noun)	timekeeper (noun)
a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat	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