How come whenever I type "able to" or "assuming" in word, I get these double blue lines below the word. They're not squiggly, so I assume they're not grammar errors. I googled it, but they only had support for single blue squiggly lines, and they were talking about style errors. I'm fairly certain I don't have a style error, and I just want it to go away because it really distracts me. Thanks for your help guys
I was able to get rid of some of the double blue underlines by unchecking "wordiness" in the preferences. I went to Word-->Preferences-->Spelling & Grammar-->Settings button (under Grammar section) and unchecked Wordiness. It's still appearing for some other errors, but at least it's not appearing as much.
All you have to do is uncheck "check grammar" in Word. Right click on the word with the blue lines underneath, and click grammar. Uncheck "check grammar" but leave "check grammar with spelling" if you want, which is what I did. All blue lines under words will be removed.
Word is programmed to check for things according to the language so it's not always right when you're typing.