Hitting the esc key seems to override the autocorrect for me. It has the same effect as hitting the X button on the suggested "correction." It's not a permanent fix for a word you need to use consistently, but it should help avoid you adding hundreds of words to the dictionary or turning off autocorrect completely

Hitting Esc seems to override the autocorrect for me. It has the same effect as hitting the X button on the suggested "correction." 

It's not a permanent fix for a word you need to use consistently, but it should help avoid you adding hundreds of words to the dictionary or turning off autocorrect completely.