| FESTILOGY | • festilogy n. A treatise on church festivals. • FESTILOGY n. a treatise on ecclesiastical festivals, also FESTOLOGY. |
| FESTOLOGY | • festology n. A form of martyrology that lists the feast days. • FESTOLOGY n. a treatise on ecclesiastical festivals, also FESTILOGY. |
| FETTLINGS | • fettlings n. Plural of fettling. • FETTLING n. loose material thrown on the hearth of a furnace to protect it. |
| FLAGGIEST | • flaggiest adj. Superlative form of flaggy: most flaggy. • FLAGGY adj. drooping. |
| FLAGSTONE | • flagstone n. A flat, rectangular piece of rock or stone used for paving or roofing. • flagstone n. One of several types of rock easily split and suitable for making flagstones. • FLAGSTONE n. a large paving stone. |
| FLEDGIEST | • FLEDGY adj. covered with feathers. |
| FLOATAGES | • floatages n. Plural of floatage. • FLOATAGE n. the act of floating, flotsam, also FLOTAGE. |
| FLUXGATES | • fluxgates n. Plural of fluxgate. • FLUXGATE n. a device for measuring a magnetic field. |
| FRAGILEST | • fragilest adj. Superlative form of fragile: most fragile. • FRAGILE adj. easily broken. |
| GATEFOLDS | • gatefolds n. Plural of gatefold. • GATEFOLD n. a folded insert in a magazine or book, also FOLDOUT. |
| GIFTABLES | • GIFTABLE n. something appropriate for a gift. |
| GOUTFLIES | • GOUTFLY n. a fly whose larvae cause gout. |
| LIFTGATES | • liftgates n. Plural of liftgate. • LIFTGATE n. a rear panel on a station wagon that opens upward. |
| SAFELIGHT | • safelight n. The lamp in a photographic darkroom. • SAFELIGHT n. a light used in a photographic darkroom etc., which emits light of an intensity and colour which will not damage the materials being processed. |
| SLUGFESTS | • slugfests n. Plural of slugfest. • SLUGFEST n. a vigorous fight. |
| STAGEFULS | • stagefuls n. Plural of stageful. • STAGEFUL n. as much as a stage can hold. |