Yes, sick is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
sick
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
What Scrabble words can I make with the letters in sick?
3 Letter Words
2 Letter Words