DORAG
Doping is a word beginning with D meaning taking drugs to increase performance.
diggers
dander
daybreak
* demise
duchess dame
This is not a "D" word but the best word in the whole of scrabble is "Mastery".
Another word for translucent is diaphanous.
Another word for service can be duty.
ditto. door. drain.
akjkiod
Doled, as in "doled out".