MAST is a playable word

mast Scrabble® Dictionary

verb
masted, masting, masts
to provide with a mast (a long pole on a ship that supports the sails and rigging)
14 Playable Words can be made from "MAST"
   2-Letter Words (5 found)
   3-Letter Words (6 found)
   4-Letter Words (3 found)