The aim of this thesis was to determine the level of lexical-semantic linguistic level in preschool children who attend a regular kindergarten class. This thesis is divided into two parts, a theoretical and a practical one. The theoretical part is devoted to knowledge on which the practical part is based. The theoretical part is divided into two chapters. The first chapter of this part describes the concept of communication, verbal and nonverbal communication, language development in children and its optimal conditions. The next chapter deals with the development of particular language levels, especially the lexical-semantic linguistic level, psychomotor development in children of pre-school age and their school readiness and education. The research section presents the survey which was carried out in a normal kindergarten class. A quantitative research was used to process the survey. The conclusion is devoted to the results of the survey which show the difference in children“s results.