This paper closely analysed and depicted the role of the hyponymy that is used in the lexical database called the Word Net to relate the words semantically with a relation "... Is a kind of...". The relation has very important role for disambiguating the senses of a polysemy word in any natural language and is, therefore, massively used in knowledge-based Word Sense Disambiguation (WSD) approaches. However, the limitation of this relation is not so cared about. In many cases, the use of the hypernymy does not only mean nothing for disambiguation but also it increases only the computational effort for the system. The improper use of hypernymy is very costly. In some cases, which are described later, the use of this relation even decreases the accuracy of the WSD approaches.