Travel is not necessarily tourism for example your journey to school, college or work is not tourism. However, if you book a holiday it is likely that you will travel to the destination whether that is in your own country or abroad and in this case it is part of tourism. Even when business people travel to another destination which is not a usual journey this would be classed as business tourism whereas the usual journey to work even if it was quite a distance from home it would not be classed as tourism but as commuting to work.
The essential difference therefore is travel that is part of a holiday or business trip outside the usual area of work and home and is not an everyday part of working life it is probably tourism.
the usual journey on a train, bus, in a car to and from a place of work is travel not tourism.