To correct you once again a compound lift or exercise is one that hits more than one muscle group at a time, 3 or more preferred. That being said doing a cable curl hits the biceps, forearms, traps, and even the delts some. As you would notice all of which were listed above. But just to make you happy bicep cable curls also makes the wrists move just so you can get multi-joint there.
Maybe you should look at some real definitions instead of pulling more shit out of your ass. And if your wrists are moving then you are doing it wrong. A cable curl is not a compound movement it's isolation. I don't know how much more clear I or anyone else can get.