ECHELLE is a playable word

echelle Scrabble® Dictionary

noun
pl. echelles
a device for spreading light into its component colors
15 Playable Words can be made from "ECHELLE"
   2-Letter Words (3 found)
   3-Letter Words (5 found)
   4-Letter Words (5 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)