| firewood | (noun) wood used for fuel | - |
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| firework | (noun) (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc. | Synonyms: pyrotechnic |
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| forewoman | (noun) a woman in charge of a group of workers | - |
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| (noun) a woman who is foreperson of a jury | Synonyms: forelady |
| foreword | (noun) a short introductory essay preceding the text of a book | Synonyms: preface, prolusion |
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| mitrewort | (noun) any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter | Synonyms: bishop's cap, miterwort |
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| rewording | (noun) changing a particular word or phrase | Synonyms: recasting, rephrasing |
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| rupturewort | (noun) common prostrate Old World herb often used as a ground cover; formerly reputed to cure ruptures | Synonyms: Hernaria glabra |
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| werewolf | (noun) a monster able to change appearance from human to wolf and back again | Synonyms: loup-garou, lycanthrope, wolfman |
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| wirework | (noun) mesh netting made of wires | Synonyms: grillwork |
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| wireworm | (noun) wormlike larva of various elaterid beetles; feeds on roots of many crop plants | - |
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