LOSSLESS is a playable word

lossless Scrabble® Dictionary

adjective
done or being without loss
35 Playable Words can be made from "LOSSLESS"
   2-Letter Words (6 found)
   3-Letter Words (9 found)
   4-Letter Words (11 found)
   5-Letter Words (6 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)