| dyke(noun, slang, defense, virago, furrow) |
| ditch(noun, block, line, defense, channel) |
| dam(noun, verb, close, secure, block) |
| wall(noun, close, cover, secure, position) |
| bar(noun, verb, secure, fasten, hedge) |
| bulwark(noun, cover, position, guard, shield) |
| barrage |
| barrier(noun, defense, embankment) |
| channel(noun, line, drain, hollow, ditch) |
| embankment(noun, cover, position, block, guard) |
| trench(noun, cover, position, line, drain) |
| bank(noun, block, defense, barrier, ridge) |
| block(noun, verb, secure, fasten, hedge) |
| brick wall |
| fence(noun, verb, close, cover, secure) |
| moat(drain, defense, ditch, channel, pit) |
| trough(noun, depression, drain, ditch, channel) |
| butch(noun, slang, virago, masculine woman) |
| gutter(noun, line, hollow, ditch, channel) |
| obstacle |