First four letters? Aside from that, writing requires the ability to form coherent arguments, evaluate the myriad of presentation options with respect to which will likely resonate best with the intended audience, and finally compose the output in a grammatically and syntactically correct manner so as to efficiently convey the information without undermining credibility or distracting by way of shoddy form. Reading is latching your brain onto the rails someone else has laid out for you and going along for the ride. Other than that they're about the same.