What It Scores
GRIM is a valid word in the tournament list this site uses. Tile values only, before any premium square: 7 in Scrabble, 8 in Words With Friends, 8 in Wordfeud. The letters break down as G2 R1 I1 M3.
Words Made From The Letters In GRIM
6 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 (2)
Longer Words Containing GRIM
GRIM 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.