| trench(noun, depression, ditch, channel, groove) |
| ditch(noun, depression, channel, pit, conduit) |
| furrow(noun, depression, ditch, channel, scrape) |
| hollow(noun, area, depression, empty, ditch) |
| dip(noun, decline, low, depression, channel) |
| channel(noun, line, water, plain, depression) |
| gutter(noun, drain, ditch, channel, pit) |
| groove(noun, drain, means, dip, channel) |
| canal(noun, depression, course, drain, means) |
| moat(noun, depression, drain, ditch, channel) |
| depression(noun, decline, low, ditch, scrape) |
| bowl |
| chute(noun, shaft, slope, tube, tray) |
| hole(noun, mine, pit, quarry) |
| pit(noun, depression, drain, hollow, ditch) |
| rut(noun, decline, low, failure, ditch) |
| cup(noun, depression, dip, channel, bottom) |
| cavity(noun, depression, hollow, scrape, mine) |
| crater(noun, depression, hollow, channel, scrape) |
| manger(noun, depression, gutter) |