  Derivation is a type of a word-formation process which creates new words from
existing ones by adding, changing or deleting affixes. In this paper, we
explore the potential of word embeddings to identify properties of word
derivations in the morphologically rich Czech language. We extract derivational
relations between pairs of words from DeriNet, a Czech lexical network, which
organizes almost one million Czech lemmata into derivational trees. For each
such pair, we compute the difference of the embeddings of the two words, and
perform unsupervised clustering of the resulting vectors. Our results show that
these clusters largely match manually annotated semantic categories of the
derivational relations (e.g. the relation 'bake--baker' belongs to category
'actor', and a correct clustering puts it into the same cluster as
'govern--governor').
