VALLUM is a playable word

vallum Scrabble® Dictionary

noun
pl. vallums
a defensive wall of earth and stone
22 Playable Words can be made from "VALLUM"
   2-Letter Words (6 found)
   3-Letter Words (8 found)
   4-Letter Words (6 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)