goop vs muck

goop and muck both are nouns.

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

As nouns, goop and muck are synonyms defined as:

Other synonyms of goop include goo, gook, guck, gunk, ooze, slime, sludge.

goop (noun)	muck (noun)
street names for gamma hydroxybutyrate	any thick, viscous matter
any thick, viscous matter	fecal matter of animals

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