| FERNALLIES | • FERNALLY n. a vascular flowerless plant, a pteridophyte, other than a fern. | 
| FERRELLING | • FERREL v. to fit with a metal cap to prevent splitting, also FERRULE, FERULE. | 
| FIBRILLINS | • fibrillins n. Plural of fibrillin. • FIBRILLIN n. a protein found in connective tissue.
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| FLATLINERS | • flatliners n. Plural of flatliner. • FLATLINER n. one who flatlines.
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| FLEERINGLY | • fleeringly adv. In a fleering manner; scornfully; with derision. • FLEERING adv. sneering, jeering.
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| FLIRTINGLY | • flirtingly adv. In a flirting manner. • FLIRTINGLY adv. FLIRTING.
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| FRAXINELLA | • fraxinella n. A fragrant herb in the rue family, Dictamnus albus. • FRAXINELLA n. a perennial herb of the rue family.
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| FRIENDLILY | • friendlily adv. (Rare) In a friendly manner; like a friend; warmly; kindly. • FRIENDLY adv. amicable.
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| FRILLINESS | • frilliness n. The quality of being frilly. • FRILLINESS n. the state of being frilly.
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| FRINGILLID | • fringillid n. (Zoology) Any of the Fringillidae; a finch. • FRINGILLID adj. related to the finches.
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| FRIVOLLING | • frivolling v. Present participle of frivol. • FRIVOL v. to behave playfully.
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| INFERNALLY | • infernally adv. In an infernal manner. • INFERNAL adv. pertaining to hell.
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| INFORMALLY | • informally adv. In an irregular or informal manner; without the usual forms. • INFORMAL adv. marked by the absence of formality or ceremony, also UNFORMAL.
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| NULLIFIERS | • nullifiers n. Plural of nullifier. • NULLIFIER n. one who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties.
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| PAINFULLER | • painfuller adj. Comparative form of painful: more painful. • PAINFUL adj. causing pain.
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| REFUELLING | • refuelling v. (British spelling) present participle of refuel. • refuelling n. (British spelling) The provision of more fuel to replace that used up.
 • REFUELLING n. the act of adding new fuel, also REFUELING.
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| TRIFLINGLY | • triflingly adv. In a trifling manner. • TRIFLING adv. trivial.
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