COLLOID is a playable word

colloid Scrabble® Dictionary

noun
pl. colloids
a type of chemical suspension
32 Playable Words can be made from "COLLOID"
   2-Letter Words (6 found)
   3-Letter Words (10 found)
   4-Letter Words (14 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)