| crag |
| crest(noun, point, edge, mountain, elevation) |
| declension(drop, fall, plunge, slide, dive) |
| declination(noun, drop, fall, collapse, inclination) |
| deflection(noun, inclination, grade, sharpness, slant) |
| delegates(noun, order, association, union, government) |
| deposit(noun, verb, set, mass, pile) |
| depression(noun, drop, fall, position, decrease) |
| devexity |
| deviation(noun, inclination, pitch, grade, sharpness) |
| diagonal(noun, inclination, grade, sharpness, slant) |
| dowel |
| downhill |
| downslide(noun, drop, fall, position, decrease) |
| downswing(noun, drop, fall, position, decrease) |
| downtrend(noun, drop, fall, position, decrease) |
| downturn(noun, drop, fall, position, decrease) |
| droop(drop, fall, plunge, slide, dive) |
| drop(noun, fall, position, decrease, collapse) |
| drop-off(noun, drop, fall, position, decrease) |