CORTEX is a playable word

cortex Scrabble® Dictionary

noun
pl. cortexes or cortices
the outer layer of an organ
(adjective) cortical
36 Playable Words can be made from "CORTEX"
   2-Letter Words (9 found)
   3-Letter Words (16 found)
   4-Letter Words (8 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)