birth control device vs device

birth control device and device both are nouns.

Word	Noun	Adjective	Verb	Adverb
birth control device	Yes	No	No	No
device	Yes	No	No	No

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

birth control device (noun)	device (noun)
an agent or device intended to prevent conception	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