private LevelResults compareWords(BxPage expected, BxPage actual) {
    Map<BxChunk, BxWord> map = BxModelUtils.mapChunksToWords(actual);

    LevelResults results = new LevelResults();
    for (BxZone expectedZone : expected) {
      if (ignoredLabels.contains(expectedZone.getLabel())) {
        continue;
      }
      for (BxLine expectedLine : expectedZone) {
        for (BxWord expectedWord : expectedLine) {
          Set<BxWord> actualWords = new HashSet<BxWord>();
          for (BxChunk chunk : expectedWord) {
            actualWords.add(map.get(chunk));
          }
          if (actualWords.size() == 1) {
            for (BxWord actualWord : actualWords) {
              if (actualWord.childrenCount() == expectedWord.childrenCount()) {
                results.matched++;
              }
            }
          }
          results.all++;
        }
      }
    }

    return results;
  }