What's the noun for american? Here's the word you're looking for.
American
Originally, a native or inhabitant of the British North American colonies of European descent; now, a person born in, or a citizen or inhabitant of, the United States of America. [from 17th c.]
An indigenous inhabitant of the Americas; a Native American or an American Indian. (Now chiefly with qualifying word.) [from 16th c.]
An inhabitant of the Americas. More often this is specified as either North American, Central American or South American.
(music) An amalgam of roots musics formed by the confluence of the shared and varied traditions that make up the American musical ethos; specifically those sounds that are merged from folk, country, blues, rhythm and blues, rock and roll and other external influential styles.