moult vs slough

moult and slough both are nouns.

Word	Noun	Adjective	Verb	Adverb
moult	Yes	No	Yes	No
slough	Yes	No	Yes	No

As verbs, moult and slough are synonyms defined as:

Other synonyms of moult include exuviate, molt, shed.

moult (noun)	slough (noun)
periodic shedding of the cuticle in arthropods or the outer skin in reptiles	any outer covering that can be shed or cast off (such as the cast-off skin of a snake)
	necrotic tissue; a mortified or gangrenous part or mass
	a stagnant swamp (especially as part of a bayou)
	a hollow filled with mud

moult (verb)	slough (verb)
cast off hair, skin, horn, or feathers	cast off hair, skin, horn, or feathers