| Solution | Length | |
|---|---|---|
| 3 letters | ||
| hor | 3 | |
| top | 3 | |
| 4 letters | ||
| jato | 4 | |
| true | 4 | |
| prop | 4 | |
| 5 letters | ||
| sheer | 5 | |
| leant | 5 | |
| yaxis | 5 | |
| plumb | 5 | |
| stile | 5 | |
| apeak | 5 | |
| erect | 5 | |
| steep | 5 | |
| right | 5 | |
| rapid | 5 | |
| sharp | 5 | |
| onend | 5 | |
| 6 letters | ||
| unbent | 6 | |
| smooth | 6 | |
| upmost | 6 | |
| 7 letters | ||
| topmost | 7 | |
| upright | 7 | |
| rampant | 7 | |
| Tip-top | 7 | |
| unbowed | 7 | |
| rearing | 7 | |
| supreme | 7 | |
| 8 letters | ||
| ultimate | 8 | |
| straight | 8 | |
| unbroken | 8 | |
| standing | 8 | |
| upraised | 8 | |
| 9 letters | ||
| unbending | 9 | |
| uppermost | 9 | |
| 10 letters | ||
| preeminent | 10 | |
| upstanding | 10 | |
| UNSWERVING | 10 | |
| 11 letters | ||
| precipitous | 11 | |
| streamlined | 11 | |
| UNDISTORTED | 11 | |
| undeviating | 11 | |
| rectilinear | 11 | |
| 13 letters | ||
| UNINTERRUPTED | 13 | |
| perpendicular | 13 | |