timekeeper vs measuring system

timekeeper and measuring system both are nouns.

Word	Noun	Adjective	Verb	Adverb
timekeeper	Yes	No	No	No
measuring system	Yes	No	No	No

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

timekeeper: a measuring instrument or device for keeping time
measuring system: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of timekeeper include measuring device, measuring instrument.

timekeeper (noun)	measuring system (noun)
a measuring instrument or device for keeping time	instrument that shows the extent or amount or quantity or degree of something
a clerk who keeps track of the hours worked by employees
(sports) an official who keeps track of the time elapsed