worm gear nut

If it has been in oil as it should be, it should not be rusted. Just get a bigger wrench, preferably a socket for a 3/4 inch breaker bar, if a 1/2 inch won't do it.
 
If you mean the cast nut on the outside that holds the worm in the housing, a good whack on the corners with a large hammer and a punch (preferably brass) will get it's attention. The end is not shaped well for a socket.
 

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