I wonder if these words are English

[Snappy]

Are the following expressions acceptable to English-speaking people?

1. Taxi stop
If no, how do you say a place in front of an airport, for example, where people wait in line to get taxis?
Can I say, "Taxi platform"?

2. Group tour bus
Chan I say, "Chartered coach" instead?

3. High-speed intercity bus
Can I say, "high-speed intercity coach" instead?

[JMurray]

snappy.
Terms like these have a lot of regional variations, so I can only tell you what I would be most likely to call them.
1) a taxi stand (I've heard "taxi stop", never "taxi platform")
2) a charter bus (in my experience more common than "chartered bus")
3) an inter-city express bus
– "coach" instead of "bus" is also common and sometimes means a more luxurious vehicle.

not a teacher

[Rover_KE]

A taxi rank.