code: def words(self, key):
          
          if self.default_mappings is not None and key not in self.mappings:
              return self.default_mappings[key].encode('utf').split("|")
          else:
              return self.mappings[key].encode('utf').split("|")
docs: Give all the synonymns of a word in the requested language 
          (or the default language if no word is available).