American English spelling vs American spelling

American English spelling and American spelling both are nouns.

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

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

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

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

American English spelling (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')