Answer:
Four french words used in American English:
déjà vu - this word means "already seen" in French, and is used to describe experiences that seem to have been lived before.
Avant-garde - this word means "vanguard" in French, and has the same meaning in English. Both words are synonyms and are used interchangeably.
cliché - this word means "printer's block" in French, but is now used in both French and English as an adjective to describe artistic works that are stereotypical.
voilà - means "see" in French, and is used as an exclamation in English to anticipate surprise, and to show something to someone.