permanent vs eonian

permanent is a noun but eonian is not a noun.

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

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

permanent (adjective)	eonian (adjective)
continuing or enduring without marked change in status or condition or place	of or relating to a geological eon (longer than an era)
not capable of being reversed or returned to the original condition	continuing forever or indefinitely