I think this just means our Nash Equilibrium has shifted a bit. If the opponent knows you know this, he'll guess 'z' and 'x' more often, so you would use words that included those probabilistically so as to foil this as often as possible. He will then guess them probabilistically accordingly, and eventually Equilibrium returns.

But if you don't wanna go through all that, I'd say just go find some non-nerds to play hangman with tonight, and enjoy the knowledge while you can.