processSynonyms(str) {
    if (this.opt.ignoreJoiners || this.opt.ignorePunctuation.length) {
      str = this.setupIgnoreJoinersRegExp(str);
    }
    return str;
  }
Setup synonyms to work with ignoreJoiners and or ignorePunctuation
@param {string} str - synonym key or value to process
@return {string} - processed synonym string