| fir | (noun) any of various evergreen trees of the genus Abies; chiefly of upland areas | Synonyms: fir tree, true fir |
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| (noun) nonresinous wood of a fir tree | - |
| fire | (noun) the act of firing weapons or artillery at an enemy | Synonyms: firing |
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| (noun) a fireplace in which a relatively small fire is burning | - |
| (noun) intense adverse criticism | Synonyms: attack, blast, flack, flak |
| (noun) the event of something burning (often destructive) | - |
| (noun) a severe trial | - |
| (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervor, fervour |
| (noun) the process of combustion of inflammable materials producing heat and light and (often) smoke | Synonyms: flame, flaming |
| (noun) fuel that is burning and is used as a means for cooking | - |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour bile | - |
| (verb) bake in a kiln so as to harden | - |
| (verb) destroy by fire | Synonyms: burn, burn down |
| (verb) start or maintain a fire in | Synonyms: ignite, light |
| (verb) become ignited | Synonyms: flame up |
| (verb) cause to go off | Synonyms: discharge |
| (verb) start firing a weapon | Synonyms: open fire |
| (verb) go off or discharge | Synonyms: discharge, go off |
| (verb) generate an electrical impulse | - |
| (verb) call forth (emotions, feelings, and responses) | Synonyms: arouse, elicit, enkindle, evoke, kindle, provoke, raise |
| (verb) drive out or away by or as if by fire | - |
| (verb) provide with fuel | Synonyms: fuel |
| (verb) terminate the employment of; discharge from an office or position | Synonyms: can, dismiss, displace, force out, give notice, give the axe, give the sack, sack, send away, terminate |
| firearm | (noun) a portable gun | Synonyms: piece, small-arm |
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| fireball | (noun) the luminous center of a nuclear explosion | - |
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| (noun) a ball of fire (such as the sun or a ball-shaped discharge of lightning) | - |
| (noun) a highly energetic and indefatigable person | Synonyms: ball of fire, human dynamo, powerhouse |
| (noun) an especially luminous meteor (sometimes exploding) | Synonyms: bolide |
| firebase | (noun) an artillery base to support advancing troops | - |
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| firebird | (noun) eastern subspecies of northern oriole | Synonyms: Baltimore bird, Baltimore oriole, hangbird, Icterus galbula galbula |
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| (noun) the male is bright red with black wings and tail | Synonyms: Piranga olivacea, redbird, scarlet tanager |
| (noun) tropical American flycatcher found as far north as southern Texas and Arizona; adult male has bright scarlet and black plumage | Synonyms: Pyrocephalus rubinus mexicanus, vermillion flycatcher |
| fireboat | (noun) a boat equipped to fight fires on ships or along a waterfront | - |
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| firebomb | (noun) a bomb that is designed to start fires; is most effective against flammable targets (such as fuel) | Synonyms: incendiary, incendiary bomb |
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| (verb) attack with incendiary bombs | - |
| firebox | (noun) a furnace (as on a steam locomotive) in which fuel is burned | - |
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| firebrand | (noun) someone who deliberately foments trouble | Synonyms: inciter, instigant, instigator, provoker |
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| (noun) a piece of wood that has been burned or is burning | Synonyms: brand |
| firebrat | (noun) lives in warm moist areas e.g. around furnaces | Synonyms: Thermobia domestica |
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| firebreak | (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: fireguard |
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| firebrick | (noun) brick made of fire clay; used for lining e.g. furnaces and chimneys | - |
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| firebug | (noun) a true bug: brightly colored bug that can exude a stain | - |
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| (noun) a criminal who illegally sets fire to property | Synonyms: arsonist, incendiary |
| fireclay | (noun) a heat-resistant clay | - |
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| firecracker | (noun) firework consisting of a small explosive charge and fuse in a heavy paper casing | Synonyms: banger, cracker |
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| fired | (adjective) having lost your job | Synonyms: discharged, dismissed, laid-off, pink-slipped |
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| firedamp | (noun) a mixture of gases (mostly methane) that form in coal mines and become explosive when mixed with air | - |
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| firedog | (noun) metal supports for logs in a fireplace | Synonyms: andiron, dog-iron, dog |
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| firedrake | (noun) a creature of Teutonic mythology; usually represented as breathing fire and having a reptilian body and sometimes wings | Synonyms: dragon, European dragon |
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| firefighter | (noun) a member of a fire department who tries to extinguish fires | Synonyms: fire-eater, fire fighter, fireman |
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| firefly | (noun) nocturnal beetle common in warm regions having luminescent abdominal organs | Synonyms: lightning bug |
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| (noun) tropical American click beetle having bright luminous spots | Synonyms: fire beetle, Pyrophorus noctiluca |
| fireguard | (noun) a metal screen before an open fire for protection (especially against flying sparks) | Synonyms: fire screen |
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| (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: firebreak |
| firehouse | (noun) a station housing fire apparatus and firemen | Synonyms: fire station |
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| firelight | (noun) the light of a fire (especially in a fireplace) | - |
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| firelighter | (noun) (a piece of) a substance that burns easily and can be used to start a coal or coke fire | - |
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| firelock | (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: flintlock |
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| fireman | (noun) play in which children pretend to put out a fire | - |
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| (noun) a member of a fire department who tries to extinguish fires | Synonyms: fire-eater, fire fighter, firefighter |
| (noun) a laborer who tends fires (as on a coal-fired train or steamship) | Synonyms: stoker |
| (noun) a pitcher who does not start the game | Synonyms: relief pitcher, reliever |
| fireplace | (noun) an open recess in a wall at the base of a chimney where a fire can be built | Synonyms: hearth, open fireplace |
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| fireplug | (noun) an upright hydrant for drawing water to use in fighting a fire | Synonyms: fire hydrant, plug |
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| firepower | (noun) (military) the relative capacity for delivering fire on a target | - |
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| fireproof | (adjective) impervious to damage by fire | - |
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| (verb) make resistant to fire | - |
| fireroom | (noun) (nautical) chamber or compartment in which the furnaces of a ship are stoked or fired | Synonyms: stokehold, stokehole |
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| fireside | (noun) home symbolized as a part of the fireplace | Synonyms: hearth |
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| (noun) an area near a fireplace (usually paved and extending out into a room) | Synonyms: hearth |
| firestone | (noun) a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns | - |
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| (noun) a piece of flint that is struck to light a fire | - |
| firestorm | (noun) an outburst of controversy | - |
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| (noun) a storm in which violent winds are drawn into the column of hot air rising over a severely bombed area | - |
| firethorn | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, pyracanth, Pyracantha |
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| firetrap | (noun) a building that would be hard to escape from if it were to catch fire | - |
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| firewall | (noun) (colloquial) the application of maximum thrust | - |
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| (noun) a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle | - |
| (noun) (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet | - |
| firewater | (noun) any strong spirits (such as strong whisky or rum) | - |
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| fireweed | (noun) tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant | Synonyms: Epilobium angustifolium, giant willowherb, rosebay willowherb, wickup |
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| (noun) an American weedy plant with small white or greenish flowers | Synonyms: Erechtites hieracifolia |
| 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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| firing | (noun) the act of setting something on fire | Synonyms: ignition, inflammation, kindling, lighting |
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| (noun) the termination of someone's employment (leaving them free to depart) | Synonyms: discharge, dismissal, dismission, liberation, release, sack, sacking |
| (noun) the act of discharging a gun | Synonyms: discharge, firing off |
| (noun) the act of firing weapons or artillery at an enemy | Synonyms: fire |
| firkin | (noun) a small wooden keg | - |
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| (noun) a British unit of capacity equal to 9 imperial gallons | - |
| firm | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, loyal, truehearted |
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| (adjective) securely fixed in place | Synonyms: fast, immobile |
| (adjective) strong and sure | Synonyms: strong |
| (adjective) not soft or yielding to pressure | Synonyms: solid |
| (adjective) possessing the tone and resiliency of healthy tissue | - |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely established | - |
| (adjective) not subject to revision or change | - |
| (adjective) (of especially a person's physical features) not shaking or trembling | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: steady, unfluctuating |
| (noun) the members of a business organization that owns or operates one or more establishments | Synonyms: business firm, house |
| (adverb) with resolute determination | Synonyms: firmly, steadfastly, unwaveringly |
| (verb) become taut or tauter | Synonyms: tauten |
| (verb) make taut or tauter | Synonyms: tauten |
| firmament | (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected | Synonyms: celestial sphere, empyrean, heavens, sphere, vault of heaven, welkin |
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| firmamental | (adjective) relating to the firmament or upper regions | - |
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| firmly | (adverb) with firmness | Synonyms: hard |
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| (adverb) with resolute determination | Synonyms: firm, steadfastly, unwaveringly |
| (adverb) in a secure manner; in a manner free from danger | Synonyms: securely |
| firmness | (noun) the quality of being steady or securely and immovably fixed in place | Synonyms: steadiness |
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| (noun) the trait of being resolute | Synonyms: firmness of purpose, resoluteness, resolution, resolve |
| (noun) the property of being unyielding to the touch | - |
| (noun) the muscle tone of healthy tissue | Synonyms: soundness |
| firmware | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: microcode |
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| first | (adjective) preceding all others in time or space or degree | Synonyms: 1st |
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| (adjective) highest in pitch or chief among parts or voices or instruments or orchestra sections | - |
| (adjective) ranking above all others | Synonyms: foremost, world-class |
| (adjective) serving to begin | Synonyms: beginning |
| (adjective) serving to set in motion | Synonyms: inaugural, initiative, initiatory, maiden |
| (noun) the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) | Synonyms: first base |
| (noun) the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving | Synonyms: first gear, low, low gear |
| (noun) an honours degree of the highest class | Synonyms: first-class honours degree |
| (noun) the first element in a countable series | Synonyms: number 1, number one |
| (noun) the first or highest in an ordering or series | Synonyms: number one |
| (noun) the time at which something is supposed to begin | Synonyms: beginning, commencement, get-go, kickoff, offset, outset, showtime, start, starting time |
| (adverb) before anything else | Synonyms: first of all, first off, firstly, foremost |
| (adverb) prominently forward | Synonyms: foremost |
| (adverb) the initial time | - |
| (adverb) before another in time, space, or importance | - |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| (noun) the offspring who came first in the order of birth | Synonyms: eldest |
| firsthand | (adjective) received directly from a source | - |
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| (adverb) from the original source; directly | Synonyms: at first hand |
| firstly | (adverb) before anything else | Synonyms: first, first of all, first off, foremost |
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| firth | (noun) a long narrow estuary (especially in Scotland) | - |
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