American spelling vs tranquillize

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

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

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

American spelling (verb)	tranquillize (verb)
	cause to be calm or quiet as by administering a sedative to
	make calm or still