Yes, sharpies is a Scrabble word!

Noun

1. An alert and energetic person

2. A professional card player who makes a living by cheating at card games

3. A pen with indelible ink that will write on any surface

4. A shallow-draft sailboat with a sharp prow, flat bottom, and triangular sail; formerly used along the northern Atlantic coast of the United States

5. An alert and energetic person

6. A professional card player who makes a living by cheating at card games