code: function ( word ) {
    const index = words[ word ];
    if ( index === undefined ) return false;
    const senses = senseMap[ index ];
    for ( let k = 0; k < senses.length; k += 1 ) {
      if ( senses[ k ] < 2 ) return true;
    }
    return false;
  }
docs: ### isAdjective 
  Checks the word in base form is an adjective or not using wordnet senses.
  
  @private
  @method isAdjective
  @param {string} word that needs to be tested for adjective.
  @return {boolean} `true` if word is a valid adjective otherwise `false.`
  @example
  isAdjective( 'lat' );
  // -> false