Any type of words, so long as they're proper English. If there's a word in there you want to challenge, you have to consult the dictionary to make sure it's in there.

[Edward pulls up a seat at the table.]

Both of you, reach into the bag and take out seven random letters. You can then place them along those little bars I have set up on each place. Make sure you don't share your letters with anyone.

I suppose I'll keep score for now.

[He pulls out a sheet of paper and begins to write down names.]