This is what I would do. I hope it helps. If you have a lot of items to add to your dictionary this may not be the fastest route.
d = {'word':1, 'word1':2}
d['word']=[1, 'something']
d['word1']=[2, 'something1']
print(d)
{'word': [1, 'something'], 'word1': [2, 'something1']}