Аннотация:The article deals with the study of neologisms and their functioning in speech. The authors analyse various ways of coining neologisms. Neologisms appear together with new notions, concepts, historical figures, or when old ones either broaden their meanings or acquire new meanings. Certain neologisms, after being units of speech, become units of the language. The article is aimed to study factors influencing the stability of neologisms, to define tendences that make neologisms stable and recurrent in speech. The authors study the reasons why the majority of unstable neologisms die out and why a small number of them become units of language and can be found in General language dictionaries, and only a small part of them become terms.