permanency vs permanent

permanency and permanent both are nouns.

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

permanency (noun)	permanent (noun)
the property of being able to exist for an indefinite duration	a series of waves in the hair made by applying heat and chemicals

permanency (adjective)	permanent (adjective)
	continuing or enduring without marked change in status or condition or place
	not capable of being reversed or returned to the original condition