SUMMAS is a playable word

summa Scrabble® Dictionary

noun
pl. summas or summae
a comprehensive work on a topic
28 Playable Words can be made from "SUMMAS"
   2-Letter Words (7 found)
   3-Letter Words (11 found)
   4-Letter Words (7 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)