Body is specifically used to describe the thick or thin sensation felt in the mouth when coffee fills the oral cavity. Usually describe the body of coffee by feeling the coffee feels heavy (bold) or lite, the texture is thick or thin. The body of coffee differs from the intensity of strong or weak coffee.
So you can make bold coffee but not low intensity.
Body also really depends on the roasting profile of the coffee beans. Closely related to the level of fat or oil content in the brewed coffee.