| ridge(verb, hit, depress, bump, knock) |
| sap(challenge, weaken, concavity) |
| scrape(noun, verb, hit, depression, bump) |
| seal(verb, check, mark, draw, stain) |
| section |
| shaft(noun, well, hole, hollow) |
| sinus(noun, space, hole, hollow, pocket) |
| smear(noun, verb, spot, stain, scratch) |
| speck(noun, mark, spot, stain, flaw) |
| stave in(verb, expression, phrasal verb, depress, scoop) |
| tarnish(noun, verb, break, hurt, mark) |
| tunnel(challenge, weaken, concavity) |
| tusk(noun, point, snag, projection, tine) |
| undermine(verb, reduce, harm, spoil, challenge) |
| valley(noun, depression, impression, dip, hollow) |
| vestige(noun, impress, imprint, dint) |
| X(mark, draw, point, spot, stain) |
| abutment cheek(expression, idiom) |
| alveolation |
| apprentice |