ticker vs timekeeper

ticker and timekeeper both are nouns.

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

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

Other hypernyms of ticker include horologe, timepiece.

ticker (noun)	timekeeper (noun)
a character printer that automatically prints stock quotations on ticker tape	a measuring instrument or device for keeping time
a small portable timepiece	a clerk who keeps track of the hours worked by employees
the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body	(sports) an official who keeps track of the time elapsed