Can you tell if someone is cheating at Words With Friends?

I play Words with Friends on Facebook pretty often and sometimes win, sometimes lose. I’d say I’m not half bad at the game and I’m pretty well educated.

Now someone started a game with me (we are on our second game now) and I am really thinking he is cheating. I looked it up and found out there are apps for that, of course, and I think he’s using one. Every single turn, he comes up with obscure words and manages to use them across all the extra point tiles. Or maybe his life as a trucker with no higher education from a small midwest town hides a deeper intellect.

Anyway, if you thought someone was cheating at a game but had no way to prove it would you say anything? Quit? Finish and not play again? Start cheating yourself?

I don’t get the point of playing if you’re going to cheat but that’s just me and I could totally be wrong and maybe he is some kind of word genius.