floral envelope vs perianth

floral envelope and perianth both are nouns.

Word	Noun	Adjective	Verb	Adverb
floral envelope	Yes	No	No	No
perianth	Yes	No	No	No

As nouns, floral envelope and perianth are synonyms defined as:

floral envelope 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 floral envelope include chlamys, perigone, perigonium.

floral envelope (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