| channel(noun, break, line, water, way) |
| pipe(noun, opening, drain, means, route) |
| conduit(noun, line, way, course, drain) |
| canal(noun, line, way, means, track) |
| passage(noun, line, way, course, opening) |
| tube(noun, line, way, drain, means) |
| aqueduct(noun, line, way, means, track) |
| ditch(noun, conduit) |
| sewer(noun, line, way, drain, means) |
| course(noun, line, path, channel, conduit) |
| gutter(noun, ditch, conduit, passageway for liquid) |
| line(noun, way, trail, route, path) |
| main(noun, line, course, means, route) |
| pipeline(noun, course, channel, passage, cylinder) |
| trough(noun, line, depression, course, drain) |
| culvert(noun, ditch, conduit) |
| drain(noun, opening, fan, channel, off) |
| flue(noun, opening, beam, fan, vent) |
| outlet(noun, place, release, escape, opening) |
| shaft(noun, something, vent, tunnel, chimney) |