Feature-Rich Part-of-speech Tagging for Morphologically Complex Languages: Application to Bulgarian

Unlike most previous work, which has used a small number of grammatical categories, we work with 680 morpho-syntactic tags. W e combine a large morphological lexicon with prior linguistic knowledge and guided learning from a POSannotated corpus, achieving accuracy of 97.98%, which is a significant improvement over the state-of-the-art for Bulgarian.