| mouth(noun, opening, hole, aperture, perforation) |
| notch(noun, depression, opening, hole, hollow) |
| opening(noun, depression, hole, hollow, dent) |
| outlet(noun, opening, hole, aperture, perforation) |
| pothole(noun, depression, opening, hole, hollow) |
| recess(noun, depression, hollow, dent, cavity) |
| tail(noun, bottom, behind, booty, backside) |
| tear(noun, opening, hole, aperture, perforation) |
| vacuity(noun, depression, hollow, dent, cavity) |
| abyss(noun, depression, hollow, dent, cavity) |
| airhole(noun, opening, hole, aperture, perforation) |
| alcove(noun, depression, hollow, dent, cavity) |
| alveolus(noun, depression, hollow, dent, cavity) |
| aperture(noun, opening, hole, perforation, orifice) |
| armhole(noun, opening, hole, aperture, perforation) |
| backside(noun, bottom, behind, booty, breech) |
| barb(noun, cut, dig, affront, dart) |
| basin(noun, depression, hollow, dent, cavity) |
| beam(noun, bottom, behind, booty, backside) |
| behind(noun, bottom, booty, backside, breech) |