covering vs indumentum

covering and indumentum both are nouns.

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

As nouns, indumentum is a hyponym of covering; that is, indumentum is a word with a more specific, narrower meaning than covering:

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

covering (noun)	indumentum (noun)
the act of protecting something by covering it	a covering of fine hairs (or sometimes scales) as on a leaf or insect
the work of applying something
the act of concealing the existence of something by obstructing the view of it
an artifact that covers something else (usually to protect or shelter or conceal it)
a natural object that covers or envelops