American spelling vs specialize

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

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

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

American spelling (verb)	specialize (verb)
	become more focused on an area of activity or field of study
	suit to a special purpose
	evolve so as to lead to a new species or develop in a way most suited to the environment
	be specific about
	devote oneself to a special area of work