Have you played FreeRice?

I was interested to hear about FreeRice on NPR (why on earth did I never listen to NPR before moving to Boston? Of course, I didn't own a car previously so listened to the radio much less often). For each word you guess right, they will donate 20 grains of rice through the UN to alleviate world hunger. Today I wasn't sure about "helicoid" but it sounded like helicopter, so I went with "spiral" and was equally dubious about "larboard" but it was "glacis" that broke my streak. . .