billiard marker vs device

billiard marker and device both are nouns.

Word	Noun	Adjective	Verb	Adverb
billiard marker	Yes	No	No	No
device	Yes	No	No	No

As nouns, device is a hypernym of billiard marker; that is, device is a word with a broader meaning than billiard marker:

billiard marker (noun)	device (noun)
a device for keeping the score in a game of billiards	any clever maneuver
	an instrumentality invented for a particular purpose
	an emblematic design (especially in heraldry)
	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect