It would be cool if you could have a text file full of all of the words so the user could add their own.
Your text file could look like this:
Python:yothnp
spam:apms
This was the user could add their own and you could just import it to a dictionary at the start like:
f = open("Words.txt")
for thing in f.split(":"):
dictionary[thing[0]]=thing[1]