The article deals with homonymic adverbs and prepositions such as blízko, dovnitř, vstříc, etc. There is a list of them in the article, besides the distribution of these homonyms in the corpus SYN2010 and positive results of their automatical disambiguation in this corpus are analysed, there is also classification and analysis of the mistakes made by the corpus during the disambiguation of these units.
It is concluded that the problems of the automatical disambiguation of homonymic adverbs and prepositions arise on the background of wide grammar homonymy in Czech language and are mainly complicated by homonymy of case forms of nouns. This research is considered to be the basis for follow-on development of particular linguistics rules necessary for improvement of the automatical disambiguation of homonymic adverbs and prepositions in the Czech national corpus.