COSSACK is a playable word

cossack Scrabble® Dictionary

noun
pl. cossacks
a Russian cavalryman
47 Playable Words can be made from "COSSACK"
   2-Letter Words (5 found)
   3-Letter Words (14 found)
   4-Letter Words (17 found)
   5-Letter Words (9 found)
   7-Letter Words (2 found)