perigonium vs perianth

perigonium and perianth both are nouns.

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

As nouns, perigonium and perianth are synonyms defined as:

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

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

perigonium (noun)	perianth (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