LUSTRA is a playable word

lustrum Scrabble® Dictionary

noun
pl. lustrums or lustra
a ceremonial purification of the population in ancient Rome
56 Playable Words can be made from "LUSTRA"
   2-Letter Words (8 found)
   3-Letter Words (19 found)
   5-Letter Words (6 found)
   6-Letter Words (2 found)