If a word conforms to a special rule, I call it a Motley Word™.
Use the following examples below to find the rule. And, if you want to analyze, here is a CSV version:
Motley Word™, Not Motley Word™ mesmerize, dazzle beacon, incandescence pigment, dye glow, gleam radiance, luster gloss, shine tincture, effulgence resplendency, sumptuousness woven, netted
Hint 2: Note: This hint may give the solution away. I suggest trying to solve it with only the first hint.