muck vs excrement

muck and excrement both are nouns.

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

muck (noun)	excrement (noun)
any thick, viscous matter	waste matter (as urine or sweat but especially feces) discharged from the body
fecal matter of animals

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