COASSIST is a playable word

coassist Scrabble® Dictionary

verb
coassisted, coassisting, coassists
to assist jointly
104 Playable Words can be made from "COASSIST"
   2-Letter Words (12 found)
   3-Letter Words (24 found)
   6-Letter Words (9 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)