When learning high- and mid-frequency words, approximately 5,000 words might be inadequate for learners to survive in a career as a tourist guide. This paper aims to construct technical word lists for Thai tourist guides to serve as supplementary learning materials. Different word lists need different criteria for their construction. Three main methods are used to construct word lists: lexical profiling, eliminating off-list words, and expert verification. The self-compiled corpus comprising 653,196 tokens gathered from www.tourismthailand.org is used to construct six sub-word lists including the technical word list for Thai tourist guides containing 391 words and the technical word lists for northern, central, eastern, northeastern, and southern Thai tourist guides composing of 245, 264, 138, 187, and 176 words, respectively. The authors suggest using the word lists after mastering 2,000 high-frequency words, 570 academic words, and 378 tourism business words to prepare learners for their future career paths.