input: Write a function to sort a list of words alphabetically.
  assert sort_words(['cat', 'dog', 'bird', 'fish']) == ['bird', 'cat', 'dog', 'fish']
  assert sort_words(['banana', 'apple', 'kiwi', 'date']) == ['apple', 'banana', 'date', 'kiwi']
  assert sort_words(['zebra', 'antelope', 'elephant', 'giraffe']) == ['antelope', 'elephant', 'giraffe', 'zebra']
output: def sort_words(words):
      return sorted(words)