molt vs moult

molt and moult both are nouns.

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

As nouns, molt and moult are synonyms defined as:

molt and moult: periodic shedding of the cuticle in arthropods or the outer skin in reptiles

Other synonyms of molt include ecdysis, molting, moulting.

As verbs, molt and moult are synonyms defined as:

Other synonyms of molt include exuviate, shed, slough.

molt (noun)	moult (noun)
periodic shedding of the cuticle in arthropods or the outer skin in reptiles	periodic shedding of the cuticle in arthropods or the outer skin in reptiles

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