Zoom lens is just a zoom lens, with variable focal length.
e.g Nikon 18-200mm. There is a limit to how close u can focus the subject and
you would not get as high a reproduction ratio compared to the macro lenses
Macro lenses are designated as such because of their ability for closer focusing and producing higher reproduction ratio.
e.g - Nikon 105mm micro - 1:1 reproduction ratio
Nikon 85mm micro PC - 1:2 reproduction ratio
yup! if you use a standard zoom of the same focal length of a macro lens (e.g. 100mm) the standard zoom has a larger minimum focussing distance, so you wont be able to get such intimate captures as the macro lens