chalk·board 
(chôkbôrd′)
(chôkbôrd′)n.
A smooth hard panel, usually green or black, for writing on with chalk; a blackboard.
- disagreement
- disallow
- disallowable
- disallowance
- disambiguate
- disambiguation
- disannul
- disannulment
- disappear
- disappearance
- disappoint
- disappointed
- disappointedly
- disappointing
- disappointingly
- disappointment
- disapprobation
- disapproval
- disapprove
- disapprover
- disapprovingly
- disarm
- disarmament
- disarmer
- disarming