code: function makeOrdinal(words) {
      // Ends with *00 (100, 1000, etc.) or *teen (13, 14, 15, 16, 17, 18, 19)
      if (ENDS_WITH_DOUBLE_ZERO_PATTERN.test(words) || ENDS_WITH_TEEN_PATTERN.test(words)) {
          return words + 'th';
      }
      // Ends with *y (20, 30, 40, 50, 60, 70, 80, 90)
      else if (ENDS_WITH_Y_PATTERN.test(words)) {
          return words.replace(ENDS_WITH_Y_PATTERN, 'ieth');
      }
      // Ends with one through twelve
      else if (ENDS_WITH_ZERO_THROUGH_TWELVE_PATTERN.test(words)) {
          return words.replace(ENDS_WITH_ZERO_THROUGH_TWELVE_PATTERN, replaceWithOrdinalVariant);
      }
      return words;
  }
docs: Converts a number-word into an ordinal number-word.
  @example makeOrdinal('one') => 'first'
  @param {string} words
  @returns {string}