unchangeable vs stable

unchangeable is not a noun while stable is a noun.

Word	Noun	Adjective	Verb	Adverb
unchangeable	No	Yes	No	No
stable	Yes	Yes	Yes	No

unchangeable (noun)	stable (noun)
	a farm building for housing horses or other livestock

unchangeable (adjective)	stable (adjective)
not changeable or subject to change	resistant to change of position or condition
	maintaining equilibrium
	firm and dependable; subject to little fluctuation
	showing little if any change
	not taking part readily in chemical change

unchangeable (verb)	stable (verb)
	shelter in a stable