slime vs sludge

slime and sludge both are nouns.

Word	Noun	Adjective	Verb	Adverb
slime	Yes	No	Yes	No
sludge	Yes	No	No	No

As nouns, slime and sludge are synonyms defined as:

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

slime (noun)	sludge (noun)
any thick, viscous matter	any thick, viscous matter
	the precipitate produced by sewage treatment

slime (verb)	sludge (verb)
cover or stain with slime