self-feeder vs feeder

self-feeder and feeder both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-feeder	Yes	No	No	No
feeder	Yes	No	No	No

As nouns, self-feeder and feeder are synonyms defined as:

self-feeder and feeder: a machine that automatically provides a supply of some material

self-feeder (noun)	feeder (noun)
a machine that automatically provides a supply of some material	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