I happen to know that there's a long list of <acronym title="French Words used in English Everyday">FWuiEE</acronym> on the Wikipedia, but I won't link to it and kill this thread.
Words I can think of off the top of my head :
• accoutrement
• savoir-faire
• risqué
• coupé (only we say coupe)
• fiancé/e
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