3 means of transport that travel on water
a boat, a ship, a yaght, a ferry, a canoe, a kayak...
3 means of transport that travel in the air
a plane, a helicopter, a blimp, a hot air balloon
3 means of transport that can carry 10 people or more
a bus, a tram, a plane, an underground...
3 means of transport that have 4 wheels or more
a bus, a taxi, a van...
