timer vs horologe

timer and horologe both are nouns.

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

As nouns, horologe is a hypernym of timer; that is, horologe is a word with a broader meaning than timer:

Other hypernyms of timer include timekeeper, timepiece.

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