chlamys vs chlamydeous

chlamys is a noun but chlamydeous is not a noun.

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

chlamys (noun)	chlamydeous (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

chlamys (adjective)	chlamydeous (adjective)
	having a floral envelope or perianth consisting of a calyx and/or corolla