Yes, reserves is a Scrabble word!

Verb

1. Hold back or set aside, especially for future use or contingency

2. Give or assign a resource to a particular person or cause

3. Obtain or arrange (for oneself) in advance

4. Arrange for and reserve (something for someone else) in advance

Noun

1. Civilians trained as soldiers but not part of the regular army

2. Formality and propriety of manner

3. Something kept back or saved for future use or a special purpose

4. An athlete who plays only when a starter on the team is replaced

5. (medicine) potential capacity to respond in order to maintain vital functions

6. A district that is reserved for particular purpose

7. Armed forces that are not on active duty but can be called in an emergency

8. The trait of being uncommunicative; not volunteering anything more than necessary