chlamys vs natural covering

chlamys and natural covering both are nouns.

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

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

chlamys: collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils
natural covering: a natural object that covers or envelops

Other hypernyms of chlamys include cover, covering, plant organ.

chlamys (noun)	natural covering (noun)
a short mantle or cape fastened at the shoulder; worn by men in ancient Greece	a natural object that covers or envelops
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils