permanent vs eternal

permanent is a noun but eternal is not a noun.

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

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

permanent (adjective)	eternal (adjective)
continuing or enduring without marked change in status or condition or place	tiresomely long; seemingly without end
not capable of being reversed or returned to the original condition	continuing forever or indefinitely