bird feeder vs device

bird feeder and device both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird feeder	Yes	No	No	No
device	Yes	No	No	No

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

bird feeder (noun)	device (noun)
an outdoor device that supplies food for wild birds	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