Yes, ahead is a Scrabble word!

Adverb

1. At or in the front

2. Toward the future; forward in time

3. In a forward direction

4. Ahead of time; in anticipation

5. To a more advanced or advantageous position

6. To a different or a more advanced time (meaning advanced either toward the present or toward the future)

7. Leading or ahead in a competition

Adjective

1. Having the leading position or higher score in a contest