feeder vs trencherman

feeder and trencherman both are nouns.

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

As nouns, trencherman is a hyponym of feeder; that is, trencherman is a word with a more specific, narrower meaning than feeder:

feeder (noun)	trencherman (noun)
an animal being fattened or suitable for fattening	a person who is devoted to eating and drinking to excess
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