| clue(noun, information, sign, influence, prompt) |
| cue(noun, act, sign, prompt, idea) |
| suggestion(noun, plan, sign, prompt, idea) |
| catchword(noun, sign, prompt, hint, suggestion) |
| evidence(noun, sign, hint, trace, key) |
| hint(noun, sign, prompt, idea, suggestion) |
| intimation(noun, sign, prompt, idea, hint) |
| key(noun, information, sign, influence, prompt) |
| lead(noun, charge, sign, prompt, idea) |
| telltale(noun, charge, information, sign, influence) |
| tip off(expression, guide, suggestion, tipoff, adumbration) |
| trace(noun, sign, hint, evidence, key) |
| ABCs(noun, information, influence, guide, key) |
| Bible(noun, information, influence, guide, key) |
| beacon(noun, information, influence, signal, key) |
| bellwether(noun, information, influence, signal, key) |
| book(noun, information, influence, guide, signal) |
| catalog(noun, information, influence, signal, key) |
| chapter and verse(noun, expression, idiom, information, influence) |
| compendium(noun, information, influence, signal, key) |