Yes, treat is a Scrabble word!

Verb

1. Interact in a certain way

2. Subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition

3. Provide treatment for

4. Act on verbally or in some form of artistic expression

5. Provide with a gift or entertainment

6. Provide with choice or abundant food or drink

7. Engage in negotiations in order to reach an agreement

8. Regard or consider in a specific way

Noun

1. Something considered choice to eat

2. An occurrence that causes special pleasure or delight