Yes, sick is a Scrabble word!

Verb

1. Eject the contents of the stomach through the mouth

Adjective

1. Affected by an impairment of normal physical or mental function

2. Feeling nausea; feeling about to vomit

3. Affected with madness or insanity

4. Having a strong distaste from surfeit

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

6. Deeply affected by a strong feeling

7. Shockingly repellent; inspiring horror

Noun

1. People who are sick