OVERBOOK is a playable word

overbook Scrabble® Dictionary

verb
overbooked, overbooking, overbooks
to issue reservations in excess of the space available
43 Playable Words can be made from "OVERBOOK"
   2-Letter Words (7 found)
   3-Letter Words (14 found)
   4-Letter Words (15 found)
   5-Letter Words (4 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)