impermanent vs ephemeral

impermanent is not a noun while ephemeral is a noun.

Word	Noun	Adjective	Verb	Adverb
impermanent	No	Yes	No	No
ephemeral	Yes	Yes	No	No

impermanent (noun)	ephemeral (noun)
	anything short-lived, as an insect that lives only for a day in its winged form

impermanent (adjective)	ephemeral (adjective)
not permanent; not lasting	lasting a very short time
existing or enduring for a limited time only