| door(noun, beginning, opening, box, entrance) |
| gateway(noun, beginning, opening, entrance, entry) |
| way in(verb, expression, phrasal verb, opening, entrance) |
| firth(noun, sound, opening, box, arm) |
| ingress(noun, opening, arm, entry, access) |
| loch(noun, arm, haven, cove, creek) |
| outlet(noun, opening) |
| channel(noun, sound, drain, stream, arm) |
| gate(noun, beginning, opening, box, entrance) |
| hole(noun, opening) |
| narrows(noun, sound, arm, passage, haven) |
| adit(noun, access) |
| admission(noun, access) |
| arm(noun, sound, water, channel, mouth) |
| brook(sound, arm, channel) |
| exit |
| frith(noun, interval, gulf lake) |
| harbor(noun, place, sound, opening, box) |
| introduce(verb, send, add, insert, interpose) |
| portico(noun, beginning, opening, entry, doorway) |