It's just called a bus or a coach, unless you are thinking about the ones with an upstairs which is known as a double-decker.
In British English, a bus is commonly referred to as a "coach" or simply a "bus" depending on the context and size of the vehicle.
Bus = bus or coach
you are in the bus That is an idiomatic expression, and the correct answer varies depending on your location. Generally, the British say "in," Americans "on."
A V.W. bus
A tourist bus. What did you expect?
because she sat in the bus but did not to leave
Front Bus and 1600
John Major. Was a bus driver and the son of a bus driver.
expansion bus
system bus
fsb...front serial bus
The Sanskrit word for bus is बस् (bas).