This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.
If a word conforms to a special rule, I call it a Shady Word™.
Use the following examples below to find the rule:
And, if you want to analyze, here is a CSV version:
Shady Words™,Not Shady Words™
BELT,CORD
BLOCK,BRICK
DRESS,GLASSES
DRIED,WETTED
HAT,COAT
LESS,MORE
LIT,MATH
SET,SPOT