Change Two Letters Game v2.0

If you can have "Pi", I can play

Xi

Isn't this straying into the bounds of Scrabble words that are tantamount to cheating?
"pi" is a perfectly good word - the sixteenth letter of the Greek alphabet and the well known mathematical constant.
This is nothing like the "Qi" word which we discussed the validity of in the original game.
 
From a two letter word, any one or two letter word is fair game. I wonder what will be chosen : )
 
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