bird feeder vs feeder

bird feeder and feeder both are nouns.

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

As nouns, bird feeder and feeder are synonyms defined as:

bird feeder and feeder: an outdoor device that supplies food for wild birds

Other synonyms of bird feeder include birdfeeder.

bird feeder (noun)	feeder (noun)
an outdoor device that supplies food for wild birds	an animal being fattened or suitable for fattening
	an animal that feeds on a particular source of food
	a machine that automatically provides a supply of some material
	an outdoor device that supplies food for wild birds
	a branch that flows into the main stream
	someone who consumes food for nourishment