| dale(noun, hollow, bottom, gorge) |
| hollow(noun, area, line, depression, dish) |
| trough(noun, hollow, bottom, gorge) |
| bottom(noun, hollow, gorge, concavity) |
| notch(noun, cut, flat, line, plain) |
| pit(noun, nature, depression, impression) |
| basin(noun, area, flat, plain, depression) |
| depression(noun, cut, flat, line, plain) |
| gulf(nature, sink, pot, bowl) |
| channel(noun, cut, flat, line, plain) |
| crater(noun, nature, depression, impression) |
| groove(noun, line, channel, bottom) |
| cavity(noun, impression, hollow, cup) |
| excavation(noun, depression, impression, hollow) |
| hole(noun, depression, dish, impression, sink) |
| cleft(noun, bottom, ravine, cavern) |
| dent(noun, depression, impression, hollow) |
| impression(noun, depression, hollow, pocket) |
| indentation(noun, cut, line, depression, impression) |
| void(noun, depression, impression, hollow) |