Special words are ones which apply to a fairly narrow range of activities, a specific geographic location, or a specific hobby such as fishing, construction or some type of sports. Before visiting a foreign location, you must think about what will be specific in terms of these things and then prepare appropriately for them. You will add a few specific words to the necessary minimum of basic words, and usually 10 to 20 additional words will be enough to talk about the specific activity.
Here you should remember a few simple truths. Learn something about the place where you are going and try to determine what is specific about it. In some places of the world there may be words which must be known even though no one will have heard about them elsewhere on the planet. These, too, are special words. The name of a poisonous snake, for instance, will not be useful to a skier in the North of Canada, but it will be of great importance to a hunter in the jungles of Brazil.
The same can be said about various hobbies. If you are travelling to a foreign country to go windsurfing, then in addition to the 100 necessary words, you should learn words such as “sail”, “mast”, “wind”, “waves”, and so on. Those will not be words which you will need, in turn, if you are planning to play golf.
If you are leaving your native country to work as a chef abroad, then you will have to learn the names of various food products and spices, but those words will not be important if you get a job as a builder.
Place names are a specific category, and learning them is a matter of safety. You should be able not just to name, but also write down place names so that you can always explain from where you have come and where you are going. Learning to write the foreign language will also be of use when the pronunciation of words in a specific region differs from that of the official language.