STEMMAS is a playable word

stemma Scrabble® Dictionary

noun
pl. stemmas or stemmata
a scroll recording the genealogy of a family in ancient Rome
85 Playable Words can be made from "STEMMAS"
   2-Letter Words (12 found)
   3-Letter Words (23 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)