Part-of-speech (POS) tagging has received a great deal of attention as it is a critical component of most natural language processing systems. In particular, there has been growing interest in both multilingual POS induction ) and cross-lingual POS induction via treebank projection (Yarowsky and Ngai, 2001; Xi and Hwa, 2005; <cite>Das and Petrov, 2011)</cite> .