Wan and Worn

Wan adjective - Lacking a healthy skin color.

Worn and wan are semantically related in tired topic. In some cases you can use "Worn" instead an adjective "Wan", when it comes to topics like colorless.

Worn adjective - Depleted in strength, energy, or freshness.

Wan and worn are semantically related in strained topic. Sometimes you can use "Wan" instead an adjective "Worn", if it concerns topics such as tired.