Yes, newest is a Scrabble word!

Adjective

1. Not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered

2. Original and of a kind not seen before

3. Lacking training or experience

4. Having no previous example or precedent or parallel

5. Other than the former one(s); different

6. Unaffected by use or exposure

7. (of a new kind or fashion) gratuitously new

8. In use after medieval times

9. Used of a living language; being the current stage in its development

10. (of crops) harvested at an early stage of development; before complete maturity

11. Unfamiliar