iridescence vs iridescent

iridescence is a noun but iridescent is not a noun.

Word	Noun	Adjective	Verb	Adverb
iridescence	Yes	No	No	No
iridescent	No	Yes	No	No

iridescence (noun)	iridescent (noun)
the visual property of something having a milky brightness and a play of colors from the surface

iridescence (adjective)	iridescent (adjective)
	having a play of lustrous rainbow colors
	varying in color when seen in different lights or from different angles