Federal agencies, including the State Department, the Department of Homeland Security and the National Counter Terrorism Center, are telling their people not to describe Islamic extremists as "jihadists" or "mujahedeen," according to documents obtained by The Associated Press. Lingo like "Islamo-fascism" is out, too.

The reason: Such words may actually boost support for radicals among Arab and Muslim audiences by giving them a veneer of religious credibility or by causing offense to moderates.

U.S. officials may be "unintentionally portraying terrorists, who lack moral and religious legitimacy, as brave fighters, legitimate soldiers or spokesmen for ordinary Muslims," says a Homeland Security report. It's entitled "Terminology to Define the Terrorists: Recommendations from American Muslims."