indumentum vs natural covering

indumentum and natural covering both are nouns.

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

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

indumentum: a covering of fine hairs (or sometimes scales) as on a leaf or insect
natural covering: a natural object that covers or envelops

Other hypernyms of indumentum include cover, covering.

indumentum (noun)	natural covering (noun)
a covering of fine hairs (or sometimes scales) as on a leaf or insect	a natural object that covers or envelops