Office 2010 – Removing Misspelled Words from Spell Checker
Spell check is a beautiful thing, until you accidentally add a misspelled word. Removing the misspelled word is easy, once you know where to find the word list. The word list is shared in all versions of Office, so the change you make in Word or Excel removes it from all applications including Outlook. The instructions below are for Office 2010, but the process is very similar for all versions of Office.
To remove a word from the spelling word list, in Word, Excel, or PowerPoint, from the File tab, choose Options. (Remember, the word list is shared between these programs and Outlook, so it doesn’t matter which you remove it from.)
Choose Proofing, then click Custom Dictionaries.

Scroll to find the misspelled word, choose Delete. Click OK, then OK again to exit the Options menu.
Sometimes it’s the little things that trip us up. Which little things have you been struggling with?