American spelling vs American English orthography

American spelling and American English orthography both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
American English orthography	Yes	No	No	No

As nouns, American spelling and American English orthography are synonyms defined as:

American spelling and American English orthography: English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

Other synonyms of American spelling include American English spelling, US English orthography, US English spelling, US spelling.

American spelling (noun)	American English orthography (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')