| Solution | Length | |
|---|---|---|
| 3 letters | ||
| vow | 3 | |
| and | 3 | |
| 4 letters | ||
| oath | 4 | |
| UPON | 4 | |
| avow | 4 | |
| aver | 4 | |
| tell | 4 | |
| cuss | 4 | |
| | ||
| 5 letters | ||
| curse | 5 | |
| ONGOD | 5 | |
| state | 5 | |
| vouch | 5 | |
| wield | 5 | |
| troth | 5 | |
| pinky | 5 | |
| 6 letters | ||
| attest | 6 | |
| affirm | 6 | |
| OBJURE | 6 | |
| pledge | 6 | |
| vilify | 6 | |
| depose | 6 | |
| assert | 6 | |
| 7 letters | ||
| testify | 7 | |
| warrant | 7 | |
| promise | 7 | |
| witness | 7 | |
| profess | 7 | |
| declare | 7 | |
| 8 letters | ||
| swear to | 8 | |
| makeavow | 8 | |
| | ||
| 9 letters | ||
| UNDERTAKE | 9 | |
| blaspheme | 9 | |
| 10 letters | ||
| TAKEANOATH | 10 | |
| UNDERWRITE | 10 | |
| 11 letters | ||
| affirmation | 11 | |