English for tourism is knowing enough English to successfully navigate in an English speaking society. Many times people travel and want to experience a country's culture and points of interest. Without knowing the basics of the language it would be very difficult to enjoy the trip. Being able to ask basic questions and respond to others in a socially appropriate manner is needed for trip enjoyment. Some examples of basic language that is needed for tourists are: "thank you", "please", "where is the ...?", "how much is ....?", and "how do I ...?".
I am guessing that you might also mean a level of English needed to function in the tourism industry. As in, enough English to get you around and to help tourists get around in a setting where they know some English but don't know the native language and so they need help.
This would not be the same level of English that is required for university entrance, etc., but would likely involve more memorization of certain key things and the ability to work with people on a more basic level of communication.
Are you asking what English word is used for "tourism?" If that is what you are asking, the word "tourism" is an English word in itself. So if you just say "tourism," any English speaker will understand you.
There are other words that can be used that mean pretty much the same thing as tourism. You can use the word "sightseeing" to mean more or less the same thing. The British use the phrase "holiday making" and Americans use the word "vacationing." But "tourism" is a widely used word in English.