"ProZ" is a proprietary term, owned by ProZ.com. As such, it is not translatable.

The inventors of this term borrowed it from the word "pros," plural of "pro," which is a contracted form of "professional." The term "professional” has several meanings, but the one implied here is, "a skilled practitioner; an expert," as defined by the American Heritage Dictionary. In this sense, "professional" can be translated as MUHTARIF or KHABEER, but that would not apply to ProZ.

Fuad