cuticle vs carapace

cuticle and carapace both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuticle	Yes	No	No	No
carapace	Yes	No	No	No

As nouns, cuticle and carapace are synonyms defined as:

cuticle and carapace: hard outer covering or case of certain organisms such as arthropods and turtles

Other synonyms of cuticle include shell, shield.

cuticle (noun)	carapace (noun)
hard outer covering or case of certain organisms such as arthropods and turtles	hard outer covering or case of certain organisms such as arthropods and turtles
the outer layer of the skin covering the exterior body surface of vertebrates
the dead skin at the base of a fingernail or toenail