Word Shark - description from Softdepia.com:
Word Shark is a fun word game for the palm. Race against time to spell as many words as possible from a 4x4 or 5x5 grid of letters. Words are validated against a local dictionary as you enter them. The demo version scores on words 3-5 letters long and operates in single player mode. Purchase the complete version to score on word 3-8 letters and compete against other players in a round-robin.
Word Shark is a "Free to try" program. You can download and try it for an evaluation period.