VAULT is a playable word

vault Scrabble® Dictionary

verb
vaulted, vaulting, vaults
to provide with a vault (an arched ceiling)
18 Playable Words can be made from "VAULT"
   2-Letter Words (5 found)
   3-Letter Words (9 found)
   4-Letter Words (3 found)
   5-Letter Words (1 found)