code: function _getWordList(_wordList, callback) {
      if(Array.isArray(_wordList)) {
  
        callback(_wordList);
  
      } else if ((typeof _wordList) === 'string') {
  
        this._fetchWordList(_wordList, callback);
  
      } else {
  
        console.error((typeof _wordList) + ' variable is not supported as data source');
        callback([]);
  
      }
    }
docs: Returns the word list base on config
  @param  {Array|String}
  @param  {Function}
  @return {Array}