In the following set of words, which is different than the others?

Question

Quizplus · Accepted Answer

Crimson is a color that a deep, rich red, inclining towards purple. It is not similar to the other words in the set because they are all different forms of blue.
Azure is a color that is bring blue in color, like a cloudless sky. It is similar to the other words in the set (excluding 'crimson') because they are all different forms of the color blue.
Cerulean is a color that is deep blue, similar to a clear sky. 
Ultramarine is a color that is a brilliant, deep blue pigment. 
Cyanic is a color that is a deep blue, very similar to 'azure'. It is similar to the other words in the set (excluding 'crimson') because they are all different forms of the color, blue.

In the Following Set of Words, Which Is Different Than