GASES is a playable word

gas Scrabble® Dictionary

verb
gassed, gassing, gases or gasses
to supply with gas (a substance capable of indefinite expansion)
20 Playable Words can be made from "GASES"
   2-Letter Words (4 found)
   3-Letter Words (9 found)
   4-Letter Words (5 found)
   5-Letter Words (2 found)