picknicker vs feeder

picknicker and feeder both are nouns.

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

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

Other hypernyms of picknicker include eater.

picknicker (noun)	feeder (noun)
a person who is picnicking	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