immovable vs American spelling

immovable and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
immovable	Yes	Yes	No	No
American spelling	Yes	No	No	No

immovable (noun)	American spelling (noun)
property consisting of houses and land	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

immovable (adjective)	American spelling (adjective)
not able or intended to be moved