I've just started playing out few word games and all seem to be pretty good, but can you suggest a bunch of really good word games available on the App store?
War of Words is the best word game ever made. http://itunes.apple.com/us/app/war-words-free-crossword-game/id395392584?mt=8 Also check out Word Colors, Wooords, Spell Tower, Scramble With Friends, Hanging with Friends, Puzzlejuice, Letterfall, Word Solitaire, Word Jigsaw, and WELDER.
Puzzlejuice (though it's really more than just a word game) and Spelltower are probably my current favorites. W.E.L.D.E.R. Was once my favorite by a longshot, but it was changed with updates and it kind of ruined the game for me. I think they have made some additional changes since, and maybe it's improved again but I haven't played lately so I'm not sure.