chlamys vs perigonium

chlamys and perigonium both are nouns.

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

As nouns, chlamys and perigonium are synonyms defined as:

chlamys 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 chlamys include floral envelope, perianth, perigone.

chlamys (noun)	perigonium (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