| Text | Length |
| Fluid-filled container | 22 |
| Fluid-filled mass | 17 |
| Fluid-filled structure | 22 |
| Fluid-injecting device | 22 |
| Fluid-level reading | 19 |
| Fluid-level reading, sometimes | 30 |
| Fluid-movement skill | 20 |
| Fluid: Prefix | 13 |
| Fluidity | 8 |
| Fluidity of movement | 20 |
| Fluidity unit | 13 |
| Fluidity units | 14 |
| Fluidless barometers | 20 |
| Fluidless, as a barometer | 25 |
| Fluidly flippant | 16 |
| Fluids | 6 |
| Fluids in bags | 14 |
| Fluids in shots | 15 |
| Fluids in syringes | 18 |
| Fluids in test tubes | 20 |
| Fluids in the veins of the gods | 31 |
| Fluids: Abbr. | 13 |
| Fluish | 6 |
| Fluish chills | 13 |
| Fluish episodes | 15 |
| Fluish feeling | 14 |
| Fluish, perhaps | 15 |
| Fluish, say | 11 |
| Fluke | 5 |
| Fluke features | 14 |
| Fluke larva | 11 |
| Fluke roll-ups? | 15 |
| Fluke: "___ Bomb" | 27 |
| Fluke? | 6 |
| Flulike ailment | 15 |
| Flulike symptom | 15 |
| Flulike symptoms | 16 |
| Flume | 5 |
| Flume floaters | 14 |
| Flumes | 6 |
| Flummery | 8 |
| Flummox | 7 |
| Flummox Helen on a movie set? | 29 |
| Flummoxed | 9 |
| Flummoxes | 9 |
| Flummoxing | 10 |
| Flump's cousin | 18 |
| Flung | 5 |
| Flung the gauntlet | 18 |
| Flung weapon | 12 |
| Flunk | 5 |
| Flunk a buoyancy test | 21 |
| Flunk out | 9 |
| Flunk out at derring-do | 23 |
| Flunkable ordeal | 16 |
| Flunked, as a test | 18 |
| Flunkeys | 8 |
| Flunkies | 8 |
| Flunkies of yore | 16 |
| Flunking a polygraph | 20 |
| Flunking a polygraph? | 21 |
| Flunking grades | 15 |
| Flunking letters | 16 |
| Flunking marks | 14 |
| Flunky | 6 |
| Flunky in "Young Frankenstein" | 40 |
| Flunky of old | 13 |
| Flunky on a movie set, e.g. | 27 |
| Flunky's answer | 19 |
| Flunky's expected reply | 27 |
| Flunky's response | 21 |
| Fluor finish | 12 |
| Fluoresce | 9 |
| Fluorescence trademark | 22 |
| Fluorescent | 11 |
| Fluorescent bulb filler | 23 |
| Fluorescent bulb gas | 20 |
| Fluorescent candy? | 18 |
| Fluorescent lamp filler | 23 |
| Fluorescent paint | 17 |
| Fluorescent pigment brand | 25 |
| Fluorescent trademark | 21 |
| Fluorescent tube gas | 20 |
| Fluorescent-lamp filler | 23 |
| Fluoresces | 10 |
| Fluoride beneficiary | 20 |
| Fluoride, e.g. | 14 |
| Fluoride, for one | 17 |
| Fluoride-in-water meas. | 23 |
| Fluorine neighbor in the periodic table | 39 |
| Fluorine or chlorine | 20 |
| Fluorine or iodine | 18 |
| Fluorine's atomic number | 28 |
| Fluorine, for one | 17 |
| Fluorine/carbon compound | 24 |
| Fluorite | 8 |
| Fluoroscope inventor | 20 |
| Fluoroscope inventor's initials | 35 |
| Fluoroscopist's aid | 23 |
| Fluoxetine hydrochloride, familiarly | 36 |
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