For starters, a cyclone and a tornado are essentially the same thing. A cyclone, or cyclonic storm, is also any kind of whirling storm, including hurricanes and typhoons. A tsunami is a giant wave, caused by an underground earthquake, I think. Hurricanes and typhoons are also types of cyclones, according to Wikipedia. The names are determined by their locations and strengths. A tornado is sort of a smaller, individual land-based cyclone. A hurricane is a giant weather system, the strongest type of storm on Earth. Hurricanes and typhoons form over water, not land. I believe a typhoon is just a hurricane that forms in the Western Pacific.