In this paper, we will try to answer two questions that arose while I was working on the Bulgarian Contactological Dictionary of Adaptation of Contact-Lexemes under Russian Influence. The first refers to the problem of selecting materials for the dictionary. The other is purely of a conceptual and terminological nature and is related to the first: why do we use the terminological phrase “contact-lexeme under dominant Russian influence” instead of the traditional term “Russianism”? And why do we use the term “contact-lexeme” instead of “loanword”? The content and structure of the dictionary will be presented in the third part of the paper.