YIRRS is a playable word

yirr Scrabble® Dictionary

verb
yirred, yirring, yirrs
to snarl
6 Playable Words can be made from "YIRRS"
   2-Letter Words (2 found)
   3-Letter Words (2 found)
   4-Letter Words (1 found)
   5-Letter Words (1 found)