molting vs moult

molting and moult both are nouns.

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

As nouns, molting and moult are synonyms defined as:

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

Other synonyms of molting include ecdysis, molt, moulting.

molting (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

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