| pit(noun, depression, impression, dip, hollow) |
| dip(noun, drop, decline, fall, depression) |
| sink(noun, drop, decline, fall, depression) |
| hollow(noun, drop, area, decline, fall) |
| sag(noun, drop, decline, fall, depression) |
| hole(noun, drop, decline, fall, depression) |
| basin(noun, drop, area, decline, fall) |
| swallow hole(noun, expression, idiom) |
| depression(noun, drop, decline, fall, dish) |
| concavity(noun, drop, decline, fall, depression) |
| doline |
| scoop(noun, informal, depression, impression, dip) |
| cenote |
| void(noun, depression, impression, dip, hollow) |
| cesspit |
| sinkage(noun, drop, decline, fall, depression) |
| swallow |
| bay(dish, sink, pot, bowl, pool) |
| collapse sinkhole(expression, idiom) |
| outfall |