CASEIN is a playable word

casein Scrabble® Dictionary

noun
pl. caseins
a milk protein
(adjective) caseic
60 Playable Words can be made from "CASEIN"
   2-Letter Words (11 found)
   3-Letter Words (20 found)
   4-Letter Words (19 found)
   5-Letter Words (8 found)
   6-Letter Words (2 found)