+ Args:
+ sig: the signature of the word to lookup (see :meth:`compute_word_sig`
+ to generate these signatures).
+ window_size: the number of nearby fuzzy matches to return
+
+ Returns:
+ A dict of word -> bool containing unscrambled words with (close
+ to or precisely) the same letters as the input word. The bool
+ values in this dict indicate whether the key word is an exact
+ or near match. The count of entries in this dict is controlled
+ by the window_size param.
+