ROSTER is a playable word

roster Scrabble® Dictionary

verb
rostered, rostering, rosters
to place in a list of names
58 Playable Words can be made from "ROSTER"
   2-Letter Words (10 found)
   3-Letter Words (18 found)
   4-Letter Words (17 found)
   5-Letter Words (8 found)
   6-Letter Words (5 found)