immobilize vs American spelling

immobilize is not a noun while American spelling is a noun.

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

immobilize (noun)	American spelling (noun)
	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

immobilize (verb)	American spelling (verb)
cause to be unable to move
prohibit the conversion or use of (assets)
convert (assets) into fixed capital
make defenseless
to hold fast or prevent from moving
hold as reserve or withdraw from circulation; of capital