Usage note: The word "Jew" is a noun. Its use as an adjective (e.g. "Jew lawyer") is widely considered offensive; "Jewish" is strongly preferred. Its use as a verb (e.g. "to jew someone") is also considered offensive. Some sources, such as the American Heritage Dictionary, suggest that phrases like "Jewish person" may be offensive if pointedly used to avoid the word "Jew".
http://en.wikipedia.org/wiki/Jews