American spelling vs useable

American spelling is a noun but useable is not a noun.

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

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

American spelling (adjective)	useable (adjective)
	convenient for use or disposal
	fit or ready for use or service
	capable of being put to use