WordBook is a comprehensive English dictionary plus much more of a Thesaurus. It provides great features and contents to discover English. It has impressive 147,000 entries with total 1.8 million words. The content is equivalent to a huge reference book of 1,800 pages! It defines words in the easiest way to read. Definitions include usage samples and synonyms. It provides word links in every definition. You can follow the links to see its synonyms, antonyms, hyponyms, and derivationally related forms.Think of a semantic graph in which you can browse to discover the whole new vocabulary.