2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151287Words unknown to the lexicon present a substantial problem to part-of-speech tagging. In this paper we present a technique for fully unsupervised statistical acquisition of rules which guess possible parts-of-speech for unknown words. Three complementary sets of word-guessing rules are induced from the lexicon and a raw corpus: prefix morphological rules, suffix morphological rules and ending-guessing rules. The learning was performed on the Brown Corpus data and rule-sets, with a highly competitive performance, were produced and compared with the state-of-the-art.8 pages, LaTeX (aclap.sty for ACL-96); Proceedings of ACL-96 Santa Cruz, USA; also see cmp-lg/9604025Computation and Languagetext