For Peace Corps volunteers and others working in countries which speak an unfamiliar language, the problems of communication can be enormous and embarrassing. This guide is designed to help avoid some of these problems. Common, local names for a variety of terms have been omitted because of the large number of Latin American dialects. The 4,300 terms listed appear in two glossaries; one is in English-Spanish and the other is Spanish-English. It is hoped that glossaries such as this will help to alleviate instructional problems in the field for Peace Corps volunteers and others in Latin America as they teach environmental concepts to those who need the knowledge. (CW)