(2) The two existing models for measuring relational similarity are: the directional similarity model <cite>(Zhila et al. (2013)</cite> ) and the dual-space model consisting of domain and function space (Turney (2012) ). The directional similarity model explores the difference of two relationships in multiple topicality dimensions in the vector space. However, it ignores the spatial distances between word vectors, which can reveal the function similarity of words in function space.