Abstract: A traditional forward dictionary is where the user inputs a word and gets one or more definitions as output. Whereas, in a reverse dictionary the user enters the desired phrase with logic and gets a certain number of words as outputs similar to the concept of the user input phrase. The reverse dictionary addresses the wide spread problem of knowing the meaning of a word, but unable to recall the appropriate word on demand .In this paper introduce a broad overview of the reverse dictionary and what are the techniques is used in reverse dictionary, some limitation of the reverse dictionary.