I've done this in a few groups but they never mix up the letters which I think would make it fun. As an example, I'll use the word
Team
You can add a letter = teams You can delete a letter = tea You can change a letter = teal You can mix up the letters and not add/change/delete = meat You can mix up the letters and change = eats
Team
You can add a letter = teams
You can delete a letter = tea
You can change a letter = teal
You can mix up the letters and not add/change/delete = meat
You can mix up the letters and change = eats
You can only change or delete one letter
We can just have fun with this.