Is it possible to remove one word from iOS autocorrect?
This solution taken from a response on URL:

How can I get the iPhone to &quot;forget&quot; certain words?

Worked for me.  It did not take nine times for it to figure it out, you experience may vary.  

Good luck,
Barry

"I opened notes, typed the word I wanted and when the incorrect autocorrect showed I pressed the cross. I pressed space bar and repeated the process 8 times. On the 9th time the incorrect suggestion stopped showing. Now it doesn't suggest the incorrect word anywhere!" 
              --answered Feb 3 '13 at 5:36
                Glenbod