WordNet has been used in earlier studies (Hirst and St-Onge, 1998;Jiang and Conrath, 1997;Lin, 1998;Leacock and Chodorow 1998;Resnik, 1995;Seco et al., 2004;Wu and Palmer, 1994) and is still a preferred knowledge source in recent works (Agirre et al., 2009).
its effectiveness may be hindered by its lack of coverage of specialized lexicons and domain specific concepts (Strube and Ponzetto, 2006;Zhang et al., 2010).