Word Spell Check

So. I typed the word "northeastern" into a document in word, and it underlines it in red. Misspelled. What are the options? Well, there's a few, but the best option is "north eastern". So, just for a lark, I select it. And it underlines it in green, meaning a grammatical or other error. So I click to see what it suggests: northeastern. 

Great. Thanks for the advice. I note Safari has no problems with northeastern or north eastern.