Yes, wan is a Scrabble word!

Verb

1. Become pale and sickly

Adjective

1. (of light) lacking in intensity or brightness; dim or feeble

2. Abnormally deficient in color as suggesting physical or emotional distress

3. Lacking vitality as from weariness or illness or unhappiness

Noun

1. A computer network that spans a wider area than does a local area network