| outlet(noun, thing, plug) |
| cavity(noun, break, area, retreat, opening) |
| jack(noun, thing) |
| hole(noun, break, retreat, opening, sack) |
| pocket(noun, sack, space, box, receptacle) |
| pit(noun, space, hole, hollow, pocket) |
| plug(noun, thing) |
| basin(noun, space, hole, hollow, pocket) |
| case(noun, case, space, box, hollow) |
| crater(noun, space, hole, hollow, pocket) |
| portfolio(noun, case, receptacle) |
| quiver(noun, case, receptacle) |
| hollow(noun, break, area, retreat, opening) |
| sheath(noun, case, receptacle) |
| receptacle(noun, sack, concavity, pouch) |
| scabbard(noun, case, receptacle) |
| alveolus |
| carton(noun, case) |
| cup(noun, dip, bottom, concavity, cavern) |
| depression(noun, break, retreat, space, hole) |