| cavum |
| bowl(noun, impression, dip, hole, hollow) |
| concavity(noun, impression, dip, void, hollow) |
| furrow(noun, depression, score, scratch, hollow) |
| nook(noun, break, space, container, hole) |
| shaft(noun, well, hole, hollow, gap) |
| sinus(noun, area, space, hole, hollow) |
| space(noun, break, cut, crack, opening) |
| trench(noun, score, well, scratch, hole) |
| well(noun, hole, hollow, gap, pit) |
| aperture(noun, break, cut, opening, breach) |
| bodily cavity(noun, expression, idiom) |
| cavern |
| cell(noun, break, space, box, container) |
| chasm(noun, break, opening, breach, well) |
| crevice(noun, break, opening, breach, box) |
| lacuna(noun, break, cut, crack, pause) |
| antrum(noun, pocket) |
| armpit(noun, area, space, hole, hollow) |
| breach(noun, break, cut, crack, opening) |