Many approaches have been recently developed that build hierarchies purely by identifying either lexical patterns or statistical features in text corpora (Yang and Callan, 2009; Snow et al., 2006; Kozareva and Hovy, 2010; Navigli et al., 2011; Zhu et al., 2013; Fu et al., 2014;<cite> Bansal et al., 2014</cite>; Tuan et al., 2014; Tuan et al., 2015; Kiela et al., 2015) .