guck vs goop

guck and goop both are nouns.

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

As nouns, guck and goop are synonyms defined as:

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

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