What's a word you know is real but refuse to play because it feels like cheating?

Morning brain is doing the thing where every two-letter word in the dictionary parades by. I still won't play 'qi' if there's any other option on the rack, even when it's clearly the right move. Curious what other people's irrational word-blockers are — not the ones that are obscure, the ones that just feel wrong in your mouth.