cesium vs American spelling

cesium and American spelling both are nouns.

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

cesium (noun)	American spelling (noun)
a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')