muck vs cowpie

muck and cowpie both are nouns.

Word	Noun	Adjective	Verb	Adverb
muck	Yes	No	Yes	No
cowpie	Yes	No	No	No

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

Other hyponyms of muck include buffalo chip, chip, cow chip, cow dung, coprolite, pigeon droppings, cow pie.

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

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