SUBSHELLS is a playable word

subshell Scrabble® Dictionary

noun
pl. subshells
one of the orbitals making up an electron shell of an atom
82 Playable Words can be made from "SUBSHELLS"
   2-Letter Words (8 found)
   3-Letter Words (16 found)
   6-Letter Words (6 found)
   7-Letter Words (4 found)
   8-Letter Words (2 found)
   9-Letter Words (1 found)