goop vs gunk

goop and gunk both are nouns.

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

As nouns, goop and gunk are synonyms defined as:

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

goop (noun)	gunk (noun)
street names for gamma hydroxybutyrate	any thick, viscous matter
any thick, viscous matter