SUBCLASS is a playable word

subclass Scrabble® Dictionary

verb
subclassed, subclassing, subclasses
to place in a subdivision of a class
60 Playable Words can be made from "SUBCLASS"
   2-Letter Words (6 found)
   3-Letter Words (18 found)
   5-Letter Words (11 found)
   6-Letter Words (1 found)
   8-Letter Words (1 found)