| signature(noun, wave, greeting, nod, salutation) |
| OK(noun, authorization, consent, permission, acceptance) |
| acknowledgments |
| antiphon(noun, return, sign, report, account) |
| assertion(noun, note, report, speech, claim) |
| assurance(noun, report, account, declaration, affirmation) |
| attestation(noun, claim, declaration, profession, affirmation) |
| back |
| back talk(noun, expression, feeling, return, sign) |
| cognition(noun, understanding, thought, reasoning) |
| communication(report, account, dispatch, declaration, message) |
| conceding(noun, yielding, recognition, acceptance, admission) |
| concurrence(noun, leave, agreement, permit, approval) |
| explanation(noun, communication, return, sign, report) |
| feedback(noun, feeling, return, sign, report) |
| identification(noun, understanding, respect, credit, thanks) |
| oath(noun, communication, understanding, notice, speech) |
| permission(noun, leave, agreement, grant, signal) |
| pledge(noun, tribute, affirmation, salute) |
| quittance(note, reward) |