horologe vs timer

horologe and timer both are nouns.

Word	Noun	Adjective	Verb	Adverb
horologe	Yes	No	No	No
timer	Yes	No	No	No

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

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

horologe (noun)	timer (noun)
a measuring instrument or device for keeping time	a timepiece that measures a time interval and signals its end
	a regulator that activates or deactivates a mechanism at set times
	(sports) an official who keeps track of the time elapsed