permanent vs impermanent

permanent is a noun but impermanent is not a noun.

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

permanent (noun)	impermanent (noun)
a series of waves in the hair made by applying heat and chemicals

permanent (adjective)	impermanent (adjective)
continuing or enduring without marked change in status or condition or place	not permanent; not lasting
not capable of being reversed or returned to the original condition	existing or enduring for a limited time only