(2015) proposed a super Taxonomies which serve as the backbone of structured knowledge are useful for many NLP applications such as question answering (Harabagiu et al., 2003) and document clustering (Fodeh et al., 2011).
the hand-crafted, well-structured taxonomies including WordNet (Miller, 1995), Open-Cyc (Matuszek et al., 2006) and Freebase (Bollacker et al., 2008) that are publicly available may not be complete for new or specialized domains.