The article is devoted to the study of that part of the primary-motivated lexicon which is sound-symbolic as opposed to sound-imitative one. This material is difficult to identify in dictionaries of modern languages mostly due to historical changes in words’ form and meaning. The authors used as the source of their material the words of fictional languages because they were constructed specially for the purposes of depicting a fictional world. The findings of the authors revealed presence in their material of the same groups of sound-symbolic words which were shown to exist in natural languages. The analysis conducted in the present article allows suggesting a new subdivision of sound-symbolic lexicon based on the semantic side of the nomination process.