perigonium vs natural covering

perigonium and natural covering both are nouns.

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

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

perigonium: 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 perigonium include cover, covering, plant organ.

perigonium (noun)	natural covering (noun)
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils	a natural object that covers or envelops