Word? lets you check one or more words against the SOWPODS or TWL word lists. Because the lists are built in, no data connection is needed.
Word? is designed as an ideal companion for Scrabble board game players. (Scrabble is a trademark of Hasbro in the US and Canada, and Mattel elsewhere).
Word? can also display the acceptable 2- and 3-letter words in SOWPODS and TWL. And it can take you directly to definitions and more about valid words on the excellent wordnik.com (this does require a data connection).
Word? is simple, elegant and easy-to-use. It supports multi-tasking on iOS4+ and retina graphics on iPhone 4.