I feel exactly like you Purr. I normally don't buy games (until lately) and I'm trying to build my vocabulary and exercise my brain more.
I already own TildeTech Word Games Suite for the same price (just bought it before I saw this thread). It has five word games (Bobble - which is like the game Boggle, and sort of like Word Pop, but it is timed and you reuse the letters), Hangman, Scramble, Bobbage, and Bobzee. I'm still familiarizing myself with the last two because I'm already addicted and constantly playing the first three, but they come with help screens and look easy to figure out. The best part is that it comes with a dictionary and offers you to look up the words. You get sooo much with this purchase! I really like it and highly recommend trialing it too. Info and screenshots at
http://www.tildetech.com/wordgames/products.htm
I have them both stored on my SD card and WordPop opens much faster and has better graphics, but I think the TildeTech suite is addicting too and a great value.