home theater vs American spelling

home theater and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
home theater	Yes	No	No	No
American spelling	Yes	No	No	No

home theater (noun)	American spelling (noun)
television and video equipment designed to reproduce in the home the experience of being in a movie theater	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')