CHECKSUM is a playable word

checksum Scrabble® Dictionary

noun
pl. checksums
a sum derived from bits of computer data
76 Playable Words can be made from "CHECKSUM"
   2-Letter Words (11 found)
   3-Letter Words (20 found)
   5-Letter Words (13 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)