backward vs American English

backward is not a noun while American English is a noun.

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

backward (noun)	American English (noun)
	the English language as used in the United States

backward (adjective)	American English (adjective)
directed or facing toward the back or rear
(used of temperament or behavior) marked by a retiring nature
retarded in intellectual development
having made less than normal progress

backward (adverb)	American English (adverb)
in a manner or order or direction the reverse of normal
in or to or toward a past time
at or to or toward the back or rear