sort by Rank | Alpha
| Possible Meanings | Rank |
| Circle Circle Dot Dot | *** |
| Concern for Dams and Development | *** |
| colour-coded Doppler devices | ** |
| Climate Change Data and Detection | ** |
| Center for Community Development and Design | ** |
| Craniofacial Development and Disorders | ** |
| Cognition Communication Development and Disability | ** |
| Communication Development and Disability | ** |
| Center for Colon Digestive Disease | * |
| Central Calorimeter Digital Data | * |
| Carbohydrate Controlled Diabetic Diet | * |
| Chrysler Central Doctor David | * |
| Cliffs Container Dorion Drum | * |