Word formation synonymy is the basis of many important processes that enrich our language. Since it turns out, that what may be, in a certain period, a weight for the language, can become a motor of major changes. By way of example, synonymic aspects derivates in the history of polish language took selected significances of basis and became semantically self-sufficient. Thanks to that excessive verbs ambiguity was evened out, simultaneouslyderivates specialised semantically. These processes played an important role in the formation of the precision of a linguistc description of events and actions.