input: Write a python function to sort a list of words in alphabetical order.
  assert sort_words(['bubble', 'selection', 'quicksort', 'insertion'])==['bubble', 'insertion', 'quicksort', 'selection']
  assert sort_words(['apple', 'banana', 'cherry'])==['apple', 'banana', 'cherry']
  assert sort_words(['dog', 'cat', 'elephant', 'bear'])==['bear', 'cat', 'dog', 'elephant']
output: def sort_words(words):
      return sorted(words)