ardor vs American spelling

ardor and American spelling both are nouns.

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

ardor (noun)	American spelling (noun)
intense feeling of love	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
a feeling of strong eagerness (usually in favor of a person or cause)
feelings of great warmth and intensity