SUBSET is a playable word

subset Scrabble® Dictionary

noun
pl. subsets
a mathematical set contained within a larger set
45 Playable Words can be made from "SUBSET"
   2-Letter Words (6 found)
   3-Letter Words (15 found)
   4-Letter Words (16 found)
   5-Letter Words (7 found)
   6-Letter Words (1 found)