Can you change grammar rules?

I don't recall seeing this before (it might be a product update or something), but suddenly the words "title company" have a blue underline, which doesn't go away until I capitalize: Title Company. "Title company" is not a proper noun, just as "tech company" or "fish bait company" are not proper nouns, so Word shouldn't indicate a grammatical error. Word apparently thinks that the name of the company is "Title," as in "Title Company, Inc."

I work for a mortgage company (also not a proper noun), so I encounter this regularly, and it's driving me nuts. Is there any way to go in there and have Word accept "title company" the same way I can add a new word to the spelling dictionary? I'm not seeing it anywhere. Please let me know. Thanks