First, we need to decide how to map WordNet part-of-speech tags to the Penn Treebank part-of-speech tags we've been using. The following is a table mapping one to the other. See the Looking up Synsets for a word in WordNet recipe in Chapter 1, Tokenizing Text and WordNet Basics, for more details. The s, which was not shown before, is just another kind of adjective, at least for tagging purposes.