cow pie vs muck

cow pie and muck both are nouns.

Word	Noun	Adjective	Verb	Adverb
cow pie	Yes	No	No	No
muck	Yes	No	Yes	No

As nouns, muck is a hypernym of cow pie; that is, muck is a word with a broader meaning than cow pie:

Other hypernyms of cow pie include droppings, dung.

cow pie (noun)	muck (noun)
fecal matter of a cow	any thick, viscous matter
	fecal matter of animals

cow pie (verb)	muck (verb)
	remove muck, clear away muck, as in a mine
	soil with mud, muck, or mire
	spread manure, as for fertilization