I wish somewhere along the way that I learned more about the Greek and Latin roots of English... and have actually contemplated buying these (or asking for them for my birthday!) to fill in the gaps in my education.
Anyhoo, the Pioneer Woman posted a link today to a website called FreeRice. It tests your vocabulary knowledge and donates grains of rice to the World Food Programme for every right answer you give! No registration required and there are other categories of knowledge to choose from if being a word nerd just isn't your thing.
I've made it to Level 42 but can't seem to muster enough brain power to get further. No worries, Eli will nap for at least another 20 minutes! (Never mind the shower I should be taking during these few minutes of peace in the house...)