ticker vs wristwatch

ticker and wristwatch both are nouns.

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

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

ticker (noun)	wristwatch (noun)
a character printer that automatically prints stock quotations on ticker tape	a watch that is worn strapped to the wrist
a small portable timepiece
the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body