American English orthography vs American spelling

American English orthography and American spelling both are nouns.

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

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

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

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

American English orthography (noun)	American spelling (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')