The subject of the article is a word formation technique which has not been thoroughly described, yet, namely the prefix-interchangeable derivation. It is still new, which is why it has not been mentioned in the first two volumes of 'Slownik gniazd slowotworczych' (The Dictionary of Word Formation Roots), including those originating from adjectives and from nouns, which Polish root word formation is based on. The text is supposed to fill in these gaps. The article indicates the capacity of the prefix-interchangeable derivation in the roots based on nouns and adjectives. There is also the description of prefixes which participate in the formation of derivatives; moreover, there are explanations of meaning of each prefix which is a part of a new word. Such characteristics may be useful in classification of each prefix-interchangeable derivation type. In conclusion, there are suggestions of solutions to the questions associated with the description of this type of derivation.
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