code: def lemmatize(self, word: str, pos: str = "n") -> str:
      """Lemmatize `word` using WordNet's built-in morphy function.
      Returns the input word unchanged if it cannot be found in WordNet.
  
      :param word: The input word to lemmatize.
      :type word: str
      :param pos: The Part Of Speech tag. Valid options are `"n"` for nouns,
          `"v"` for verbs, `"a"` for adjectives, `"r"` for adverbs and `"s"`
          for satellite adjectives.
      :type pos: str
      :return: The lemma of `word`, for the given `pos`.
      """
      lemmas = wn._morphy(word, pos)
      return min(lemmas, key=len) if lemmas else word
  
label_desc: Use image node_id 1 for calling the WordNetLemmatizer obj's underlying member method code with example usage: obj.lemmatize(word, pos) and returns: unknown