Yes, curling is a Scrabble word!

Verb

1. Form a curl, curve, or kink

2. Shape one's body into a curl

3. Wind around something in coils or loops

4. Twist or roll into coils or ringlets

5. Play the Scottish game of curling

Adjective

1. Of hair having curls

Noun

1. A game played on ice in which heavy stones with handles are slid toward a target