capping machine vs device

capping machine and device both are nouns.

Word	Noun	Adjective	Verb	Adverb
capping machine	Yes	No	No	No
device	Yes	No	No	No

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

capping machine (noun)	device (noun)
A manual or automatic device that is used to cap bottles.	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