exoskeleton vs body covering

exoskeleton and body covering both are nouns.

Word	Noun	Adjective	Verb	Adverb
exoskeleton	Yes	No	No	No
body covering	Yes	No	No	No

As nouns, body covering is a hypernym of exoskeleton; that is, body covering is a word with a broader meaning than exoskeleton:

exoskeleton: the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
body covering: any covering for the body or a body part

Other hypernyms of exoskeleton include frame, skeletal system, skeleton, systema skeletale.

exoskeleton (noun)	body covering (noun)
the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs	any covering for the body or a body part