isomerization vs American spelling

isomerization and American spelling both are nouns.

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

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