integument vs natural covering

integument and natural covering both are nouns.

Word	Noun	Adjective	Verb	Adverb
integument	Yes	No	No	No
natural covering	Yes	No	No	No

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

integument: an outer protective covering such as the skin of an animal or a cuticle or seed coat or rind or shell
natural covering: a natural object that covers or envelops

Other hypernyms of integument include cover, covering.

integument (noun)	natural covering (noun)
an outer protective covering such as the skin of an animal or a cuticle or seed coat or rind or shell	a natural object that covers or envelops