| ditch(noun, depression, channel, conduit) |
| furrow(noun, depression, ditch, channel, scrape) |
| hollow(noun, area, depression, empty, ditch) |
| gutter(noun, drain, ditch, channel) |
| canal(noun, depression, course, drain, means) |
| moat(noun, depression, drain, ditch, channel) |
| depression(noun, decline, low, ditch, scrape) |
| hole(noun, mine, quarry) |
| rut(noun, decline, low, failure, ditch) |
| cavity(noun, depression, hollow, scrape, mine) |
| cut(noun, depression, hollow, ditch, scrape) |
| dike(noun, depression, drain, ditch, channel) |
| excavation(noun, drain, dip, ditch, bottom) |
| gully(noun, depression, ditch, channel) |
| mine(noun, channel, trench, quarry) |
| quarry(noun, mine) |
| burrow(noun, mine, quarry) |
| drain(noun, race, ditch, channel) |
| shaft(noun, mine, quarry, tube) |
| main(noun, line, drain, means, ditch) |