What It Scores
UPPER is a valid word in the tournament list this site uses. Tile values only, before any premium square: 9 in Scrabble and 12 in Words With Friends. The letters break down as U1 P3 P3 E1 R1.
Words Made From The Letters In UPPER
19 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.
4 letter words (5)
3 letter words (9)
2 letter words (5)
Longer Words Containing UPPER
UPPER 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.