American spelling vs fertilization

American spelling and fertilization both are nouns.

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

American spelling (noun)	fertilization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant
	making fertile as by applying fertilizer or manure