code: public static boolean isPlural(final String _word) {
          final String word = toEngLowerCase(_word);
  
          // word + s
          if (word.endsWith("s")) {
              final String wordStub = word.substring(0, word.length() - 1);
              if (checkup(wordStub) != null) return true;
          }
  
          // word + ed
          if (word.endsWith("ed")) {
              final String wordStub = word.substring(0, word.length() - 2);
              if (checkup(wordStub) != null) return true;
          }
  
          // word(-y) + ied
          if (word.endsWith("ied")) {
              final String wordStub = word.substring(0, word.length() - 3) + "y";
              if (checkup(wordStub) != null) return true;
          }
  
          return false;
      }
docs: This method checks if the word is a plural form.