stock ticker vs serial printer

stock ticker and serial printer both are nouns.

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

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

stock 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 stock ticker include character-at-a-time printer, character printer.

stock 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