Words in USA

Words in USA are the same as words everywhere else.

A word is "a distinct unit of language (sounds in speech or written letters) with a particular meaning, composed of one or more morphemes, and also of one or more phonemes that determine its sound pattern." (Courtesy of Wiktionary)

This, I believe, is not what you meant to ask. Perhaps you would care to decipher your question in order to receive a proper answer.

Might it be you wanted to know what the letters "USA" stand for? It is an acronym for the United States of America.