COBALT is a playable word

cobalt Scrabble® Dictionary

noun
pl. cobalts
a metallic element
(adjective) cobaltic
53 Playable Words can be made from "COBALT"
   2-Letter Words (9 found)
   3-Letter Words (22 found)
   4-Letter Words (19 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)