For people who have a tough time with computers like I do, I found another way to do this.
If you go into Word on the very first ribbon at the way top where there's the Word logo and save, undo, repeat and all that good stuff there should also be a little arrow pointing down with a line above it, click on it and you'll get a list of options, you want to click on More Commands.
When you do that a new window will pop open with more options like General, Display, Save, Language, etc. You want to click on Proofing. Under the heading 'When Correcting spelling in Microsoft Programs' click on Custom Dictionaries and another new window will open. Now highlight
by clicking on the words not the check box. Once highlighted click Edit Word list on the right in the window. Yet another window will open and you can pick the word you accidentally saved and delete it or delete it all and press okay once your done and there you have it.
I hope that wasn't too confusing or anything, I just wanted to share an easier way that I found to remove words from your dictionary.