Geostationary means the same point on earth is in the same spot, or more specifically the satellite is in the same spot in the sky all the time relative to earth. Geosynchronous means the same spot is in the same position at the same time every day. Usually geosynchronous orbits require some amount of inclination and with inclination and retrograde orbit would make it really difficult to intercept anything as you'd be in a different plane from your "target" in every orbit. Further decreasing your odds of intercept.