Check this one out! FreeRice.com
You play a game and the site donates rice to the needy for every correct answer you submit.
Here's an example of one of the words I was given: stentorian
See how good you are or do like I did and cheat by opening another browser and looking up the definition on M-W.com.
Don't think that just because you donated 100 grains of rice you "did your part" :-)