perigonium vs plant organ

perigonium and plant organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
perigonium	Yes	No	No	No
plant organ	Yes	No	No	No

As nouns, plant organ is a hypernym of perigonium; that is, plant organ 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
plant organ: a functional and structural unit of a plant or fungus

Other hypernyms of perigonium include cover, covering, natural covering.

perigonium (noun)	plant organ (noun)
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils	a functional and structural unit of a plant or fungus