American spelling vs unitize

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

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

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

American spelling (verb)	unitize (verb)
	separate or classify into units
	make into a unit
	divide (bulk material) and process as units