SEATMATE is a playable word

seatmate Scrabble® Dictionary

noun
pl. seatmates
one with whom one shares a seat
108 Playable Words can be made from "SEATMATE"
   2-Letter Words (12 found)
   3-Letter Words (27 found)
   6-Letter Words (5 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)