American English orthography vs US English orthography

American English orthography and US English orthography both are nouns.

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

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

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

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

American English orthography (noun)	US 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')