American spelling vs self-fertilization

American spelling and self-fertilization both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
self-fertilization	Yes	No	No	No

American spelling (noun)	self-fertilization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	fertilization by the union of male and female gametes from the same individual