perianth vs perigonium

perianth and perigonium both are nouns.

Word	Noun	Adjective	Verb	Adverb
perianth	Yes	No	No	No
perigonium	Yes	No	No	No

As nouns, perianth and perigonium are synonyms defined as:

perianth and perigonium: collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils

Other synonyms of perianth include chlamys, floral envelope, perigone.

perianth (noun)	perigonium (noun)
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils	collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils