Macro lenses have much shorter minimum (i.e. closest) focus distance and hence can shoot very close to the subject and have higher magnification (such as 1:1) of the subject as appeared in the frame. Also Macro lenses are designed to have less aberrations (distortion) when shooting at very short distance from the subject.
Tele lenses, with higher minimum focus distance, can't focus if you're shooting very close to the subject.