CUSTOS is a playable word

custos Scrabble® Dictionary

noun
pl. custodes
a guardian or keeper
35 Playable Words can be made from "CUSTOS"
   2-Letter Words (5 found)
   3-Letter Words (10 found)
   4-Letter Words (12 found)
   5-Letter Words (6 found)
   6-Letter Words (2 found)