American spelling vs isomerization

American spelling and isomerization both are nouns.

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

American spelling (noun)	isomerization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the conversion of a compound into an isomer of itself