covering vs natural object

covering and natural object both are nouns.

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

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

covering (noun)	natural object (noun)
the act of protecting something by covering it	an object occurring naturally; not made by man
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