code: function( keyphrase, synonyms, language = "en", morphologyData ) {
  	const synonymsSplit = parseSynonyms( synonyms );
  
  	const keyphraseForms = buildForms( keyphrase, language, morphologyData );
  	const synonymsForms = synonymsSplit.map( synonym => buildForms( synonym, language, morphologyData ) );
  
  	return {
  		keyphraseForms: keyphraseForms,
  		synonymsForms: synonymsForms,
  	};
  }
docs: Builds morphological forms of words of the keyphrase and of each synonym phrase.
  
  @param {string} keyphrase The paper's keyphrase.
  @param {string} synonyms The paper's synonyms.
  @param {string} language The paper's language.
  @param {Object} morphologyData The available morphology data to be used by the getForms function (language specific).
  
  @returns {Object} Object with an array of keyphrase forms and an array of arrays of synonyms forms.