What It Scores
UNPEN is a valid word in the tournament list this site uses. Tile values only, before any premium square: 7 in Scrabble and 9 in Words With Friends. The letters break down as U1 N1 P3 E1 N1.
Words Made From The Letters In UNPEN
10 shorter words come out of these tiles. On a board that matters more than the long play, because a short word on a premium square often beats a long one on plain squares.
3 letter words (4)
2 letter words (6)
Longer Words Containing UNPEN
UNPEN appears inside each of these, which is what makes it worth knowing as a hook.
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.