| hollow(noun, area, line, depression, dish) |
| notch(noun, cut, flat, line, plain) |
| pit(noun, nature, depression, impression, dip) |
| basin(noun, area, flat, plain, depression) |
| depression(noun, cut, flat, line, plain) |
| channel(noun, cut, flat, line, plain) |
| crater(noun, nature, depression, impression, dip) |
| groove(noun, line, dip, channel, bottom) |
| cavity(noun, impression, dip, hollow) |
| excavation(noun, depression, impression, dip, hollow) |
| hole(noun, depression, dish, impression, sink) |
| dip(noun, depression, dish, impression, sink) |
| indentation(noun, cut, line, depression, impression) |
| void(noun, depression, impression, dip, hollow) |
| concavity(noun, depression, dish, impression, sink) |
| sinkage(noun, depression, dish, impression, sink) |
| sinkhole(noun, depression, dish, impression, sink) |
| vacuity(noun, depression, impression, dip, hollow) |
| bowl(noun, depression, dish, impression, sink) |
| dimple(noun, depression, impression, dip, hollow) |