Yes, dead is a Scrabble word!

Adverb

1. Quickly and without warning

2. Completely and without qualification; used informally as intensifiers

Adjective

1. No longer having or seeming to have or expecting to have life

2. Not showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat

3. Very tired

4. Unerringly accurate

5. Physically inactive

6. (followed by `to') not showing human feeling or sensitivity; unresponsive

7. Devoid of physical sensation; numb

8. Lacking acoustic resonance

9. Not yielding a return

10. Not circulating or flowing

11. Not surviving in active use

12. Lacking resilience or bounce

13. Out of use or operation because of a fault or breakdown

14. No longer having force or relevance

15. Complete

16. Drained of electric charge; discharged

17. Devoid of activity; nothing ever happens here"

Noun

1. People who are no longer living

2. A time when coldness (or some other quality associated with death) is intense