Each definition contains the Word, POS, and Synset list: (funny (adjective (root funny) (orth "funny") (synset ("funny%4:02:01::" "funny%4:02:00::"))))) WordNet only contains open-class words: Nouns, Adjectives, Adverbs, and Verbs (Miller et al, 1993).
determiners, subordinating conjunctions, coordinating conjunctions, and pronouns all had to be hand created.