The expansion of new fields of knowledge and modern technologies has an increasingly important impact on the development and the evolution of terminological systems of languages. Thus, ecological terminology, as a part of this field, is continuously changing and undergoes the same processes that belong to the common language, such as: synonymy, antonymy, polisemy, homonymy, and others. Moreover, the ecological terminological system is an open system which allows the penetration of new terms by various ways, for instance: the connection with the common language, the influence of foreign languages, etc.