ticker vs serial printer

ticker and serial printer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ticker	Yes	No	No	No
serial printer	Yes	No	No	No

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

ticker: a character printer that automatically prints stock quotations on ticker tape
serial printer: a printer that prints a single character at a time

Other hypernyms of ticker include character-at-a-time printer, character printer.

ticker (noun)	serial printer (noun)
a character printer that automatically prints stock quotations on ticker tape	a printer that prints a single character at a time
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