chicken feed vs mash

chicken feed and mash both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicken feed	Yes	No	No	No
mash	Yes	No	Yes	No

As nouns, mash is a hypernym of chicken feed; that is, mash is a word with a broader meaning than chicken feed:

chicken feed (noun)	mash (noun)
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant	mixture of ground animal feeds
dry mash for poultry	a mixture of mashed malt grains and hot water; used in brewing

chicken feed (verb)	mash (verb)
	reduce to small pieces or particles by pounding or abrading
	talk or behave amorously, without serious intentions
	to compress with violence, out of natural shape or condition