chlamys vs floral envelope

chlamys and floral envelope both are nouns.

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

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

chlamys and floral envelope: collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils

Other synonyms of chlamys include perianth, perigone, perigonium.

chlamys (noun)	floral envelope (noun)
a short mantle or cape fastened at the shoulder; worn by men in ancient Greece	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