sizable vs American spelling

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

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

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

sizable (adjective)	American spelling (adjective)
large in amount or extent or degree
fairly large in size