digital watch vs ticker

digital watch and ticker both are nouns.

Word	Noun	Adjective	Verb	Adverb
digital watch	Yes	No	No	No
ticker	Yes	No	No	No

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

Other hypernyms of digital watch include watch.

digital watch (noun)	ticker (noun)
a watch with a digital display	a character printer that automatically prints stock quotations on ticker tape
	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