American spelling vs myelinization

American spelling and myelinization both are nouns.

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

American spelling (noun)	myelinization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the development of a myelin sheath around a nerve fiber