| faintest idea(noun, expression, idea, hint, clue) |
| fancy(noun, form, concept, end, feeling) |
| fancying(noun, concept, understanding, grasp, command) |
| fantasy(noun, supposition) |
| flash(noun, form, concept, end, feeling) |
| flea in ear(noun, expression, idiom, taste, sign) |
| foggiest idea(noun, expression, idea, hint, clue) |
| foreboding(noun, feeling, idea, apprehension, awareness) |
| forecast(noun, feeling, point, prompt, idea) |
| foreknowledge(noun, feeling, idea, instinct, premonition) |
| foretoken |
| forewarning(noun, expression, feeling, sign, prompt) |
| forewisdom(noun, feeling, idea, instinct, premonition) |
| funny feeling(noun, expression, feeling, idea, instinct) |
| germ(noun, beginning, stone, source, nut) |
| grain(noun, beginning, stone, shine, nut) |
| half an idea(expression, idiom) |
| hazy idea |
| help(noun, taste, sign, idea, suggestion) |
| hot lead(noun, expression, sign, prompt, idea) |