What It Scores
GRRL is a valid word in the tournament list this site uses. Tile values only, before any premium square: 5 in Scrabble and 6 in Words With Friends. The letters break down as G2 R1 R1 L1.
Longer Words Containing GRRL
GRRL 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.