American spelling vs hypothesize

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

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

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

American spelling (verb)	hypothesize (verb)
	to believe especially on uncertain or tentative grounds