American spelling vs synthesize

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

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

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

American spelling (verb)	synthesize (verb)
	combine so as to form a more complex, product
	combine and form a synthesis