Yes, enters is a Scrabble word!

Verb

1. To come or go into

2. Become a participant; be involved in

3. Register formally as a participant or member

4. Be or play a part of or in

5. Make a record of; set down in permanent form

6. Come on stage

7. Take on duties or office

8. Put or introduce into something

9. Set out on (an enterprise or subject of study)