RIDGES is a playable word

ridge Scrabble® Dictionary

verb
ridged, ridging, ridges
to form into ridges (long, narrow elevations)
70 Playable Words can be made from "RIDGES"
   2-Letter Words (9 found)
   3-Letter Words (23 found)
   5-Letter Words (10 found)
   6-Letter Words (3 found)