BUCKOS is a playable word

bucko Scrabble® Dictionary

noun
pl. buckos or buckoes
a bully
32 Playable Words can be made from "BUCKOS"
   2-Letter Words (5 found)
   3-Letter Words (12 found)
   4-Letter Words (11 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)