Hurricnes, Cyclones and Typhoons are the SAME thing. They are just called by different names in different parts f the world. Hurricanes: Atlantic and E. Pacific. Typhoons: W. Pacific. Cyclones: S Pacific and Indian Ocean and Bay of Bangel.
Tornados are totally different. However, hurricanes/cyclones/typhoons can spawn tornados. However, tornados can't spawn hurricanes. Tornados happen over land when thunderstorm cells have rotation in them. Over land.
Also, just so Blair Waldorf is aware and you too: in the E Pacaifc they are Hurricanes, its the W Pac. where they are typhoons :-)