Yes, relaxing is a Scrabble word!

Adjective

1. Affording physical or mental rest

Verb

1. Become less tense, rest, or take one's ease

2. Make less taut

3. Become loose or looser or less tight

4. Cause to feel relaxed

5. Become less tense, less formal, or less restrained, and assume a friendlier manner

6. Make less severe or strict

7. Become less severe or strict

8. Make less active or fast