What It Scores
YIRR is a valid word in the tournament list this site uses. Tile values only, before any premium square: 7 in Scrabble and 7 in Words With Friends. The letters break down as Y4 I1 R1 R1.
Longer Words Containing YIRR
YIRR 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.