This is a numpire.
The British paper The Guardian recently ran an article about how English has changed and continues to change because of mistakes in pronunciation. You may not have to wait too long before ex-presso and ex cetera become standard (although I will fight to the finish to prevent this).
Did you know that apron, umpire and adder at one time all began with an N? The blacksmith wore a napron, the referee of a game (Quiddich, perhaps?) was a numpire, and a dangerous snake was a nadder.
I’ll have a lot more tidbits from this fascinating article in the coming days. If you’re interested, grab an ESpresso and stay tuned.