If you use Alfred, which you should, there's a neat little spell function that you probably didn't know about. The next time you're not sure how to spell a word (or the next time spell check just can't guess what the heck it is that you're typing) hit COMMAND + SPACE (or whatever hotkey you have set) to pop open Alfred. Then type the word "spell" followed by your best guess as to how to spell the word that you're trying to type. Alfred will show you a list of options along with a dictionary definition for each of them. Then just use the arrow keys to choose which one you want, hit "Enter", and the proper spelling of the term will be copied to your clipboard. Paste it into your application. Smile.