| abseil | (noun) (mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body | Synonyms: rappel |
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| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| agnail | (noun) a loose narrow strip of skin near the base of a fingernail; tearing it produces a painful sore that is easily infected | Synonyms: hangnail |
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| ail | (noun) aromatic bulb used as seasoning | Synonyms: garlic |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anil | (noun) shrub of West Indies and South America that is a source of indigo dye | Synonyms: Indigofera anil, Indigofera suffruticosa |
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| (noun) a blue dye obtained from plants or made synthetically | Synonyms: indigo, indigotin |
| anvil | (noun) a heavy block of iron or steel on which hot metals are shaped by hammering | - |
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| (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: incus |
| archil | (noun) any of various lecanoras that yield the dye archil | Synonyms: orchil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: cudbear, orchil |
| argil | (noun) a white clay (especially a white clay used by potters) | - |
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| aril | (noun) fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelops the seed | - |
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| avail | (noun) a means of serving | Synonyms: help, service |
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| aventail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: camail, ventail |
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| axil | (noun) the upper angle between an axis and an offshoot such as a branch or leafstalk | - |
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| bail | (noun) the legal system that allows an accused person to be temporarily released from custody (usually on condition that a sum of money guarantees their appearance at trial) | - |
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| (noun) (criminal law) money that must be forfeited by the bondsman if an accused person fails to appear in court for trial | Synonyms: bail bond, bond |
| bandtail | (noun) wild pigeon of western North America; often mistaken for the now extinct passenger pigeon | Synonyms: band-tail pigeon, band-tailed pigeon, Columba fasciata |
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| bangtail | (noun) a horse bred for racing | Synonyms: race horse, racehorse |
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| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basophil | (noun) a leukocyte with basophilic granules easily stained by basic stains | Synonyms: basophile |
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| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| bobtail | (noun) a short or shortened tail of certain animals | Synonyms: bob, dock |
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| (noun) large sheepdog with a profuse shaggy bluish-grey-and-white coat and short tail; believed to trace back to the Roman occupation of Britain | Synonyms: Old English sheepdog |
| boil | (noun) the temperature at which a liquid boils at sea level | Synonyms: boiling point |
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| (noun) a painful sore with a hard core filled with pus | Synonyms: furuncle |
| brail | (noun) a small rope (one of several) used to draw a sail in | - |
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| (noun) a small net used to draw fish into a boat | - |
| brazil | (noun) three-sided tropical American nut with white oily meat and hard brown shell | Synonyms: brazil nut |
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| bristletail | (noun) small wingless insect with a long bristlelike tail | - |
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| broadtail | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: caracul, karakul |
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| (noun) the fur of a very young karakul lamb | - |
| broil | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broiling, grilling |
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| bromoil | (noun) a print made by the bromoil process having soft, paint-like qualities. | - |
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| browntail | (noun) small brown and white European moth introduced into eastern United States; pest of various shade and fruit trees | Synonyms: brown-tail moth, Euproctis phaeorrhoea |
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| bulbil | (noun) small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers | Synonyms: bulblet |
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| camail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: aventail, ventail |
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| captopril | (noun) a drug (trade name Capoten) that blocks the formation of angiotensin in the kidneys resulting in vasodilation; used in the treatment of hypertension and congestive heart failure | Synonyms: Capoten |
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| cattail | (noun) tall erect herbs with sword-shaped leaves; cosmopolitan in fresh and salt marshes | - |
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| cavil | (noun) an evasion of the point of an argument by raising irrelevant distinctions or objections | Synonyms: quibble, quiddity |
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| cefadroxil | (noun) a cephalosporin antibiotic (trade name Ultracef) | Synonyms: Ultracef |
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| chervil | (noun) fresh ferny parsley-like leaves used as a garnish with chicken and veal and omelets and green salads and spinach | - |
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| (noun) aromatic annual Old World herb cultivated for its finely divided and often curly leaves for use especially in soups and salads | Synonyms: Anthriscus cereifolium, beaked parsley |
| chlorambucil | (noun) an alkylating agent (trade name Leukeran) used to treat some kinds of cancer | Synonyms: Leukeran |
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| cinquefoil | (noun) an ornamental carving consisting of five arcs arranged in a circle | - |
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| (noun) any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties | Synonyms: five-finger |
| coattail | (noun) the loose back flap of a coat that hangs below the waist | - |
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| cocktail | (noun) a short mixed drink | - |
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| (noun) an appetizer served as a first course at a meal | - |
| codicil | (noun) a supplement to a will; a testamentary instrument intended to alter an already executed will | - |
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| coil | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: helix, spiral, volute, whorl |
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| (noun) reactor consisting of a spiral of insulated wire that introduces inductance into a circuit | - |
| (noun) tubing that is wound in a spiral | - |
| (noun) a contraceptive device placed inside a woman's womb | - |
| (noun) a transformer that supplies high voltage to spark plugs in a gasoline engine | - |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: curl, curlicue, gyre, ringlet, roll, scroll, whorl |
| contrail | (noun) an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust | Synonyms: condensation trail |
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| cottontail | (noun) common small rabbit of North America having greyish or brownish fur and a tail with a white underside; a host for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks) | Synonyms: cottontail rabbit, wood rabbit |
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| council | (noun) a meeting of people for consultation | - |
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| (noun) a body serving in an administrative capacity | - |
| (noun) (Christianity) an assembly of theologians and bishops and other representatives of different churches or dioceses that is convened to regulate matters of discipline or doctrine | - |
| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| courbaril | (noun) West Indian locust tree having pinnate leaves and panicles of large white or purplish flowers; yields very hard tough wood | Synonyms: Hymenaea courbaril |
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| daffodil | (noun) any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown | Synonyms: Narcissus pseudonarcissus |
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| daredevil | (noun) a reckless impetuous irresponsible person | Synonyms: harum-scarum, hothead, lunatic, madcap, swashbuckler |
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| detail | (noun) an isolated fact that is considered separately from the whole | Synonyms: item, point |
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| (noun) extended treatment of particulars | - |
| (noun) a temporary military unit | Synonyms: contingent |
| (noun) a crew of workers selected for a particular task | - |
| (noun) a small part that can be considered separately from the whole | Synonyms: item, particular |
| devil | (noun) a word used in exclamations of confusion | Synonyms: deuce, dickens |
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| (noun) an evil supernatural being | Synonyms: daemon, daimon, demon, fiend |
| (noun) a cruel wicked and inhuman person | Synonyms: demon, fiend, monster, ogre |
| (noun) a rowdy or mischievous person (usually a young man) | Synonyms: heller, hellion |
| doornail | (noun) a nail with a large head; formerly used to decorate doors | - |
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| dovetail | (noun) a mortise joint formed by interlocking tenons and mortises | Synonyms: dovetail joint |
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| email | (noun) (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in | Synonyms: e-mail, electronic mail |
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| enalapril | (noun) an ACE inhibitor (trade name Vasotec) that blocks the formation of angiotensin in the kidney and so results in vasodilation; administered after heart attacks | Synonyms: Vasotec |
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| entail | (noun) the act of entailing property; the creation of a fee tail from a fee simple | - |
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| (noun) land received by fee tail | - |
| eosinophil | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophile |
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| evil | (noun) morally objectionable behavior | Synonyms: immorality, iniquity, wickedness |
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| (noun) the quality of being morally wrong in principle or practice | Synonyms: evilness |
| fantail | (noun) an overhang consisting of the fan-shaped part of the deck extending aft of the sternpost of a ship | - |
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| fauteuil | (noun) an upholstered armchair | - |
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| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| fibril | (noun) a very slender natural or synthetic fiber | Synonyms: filament, strand |
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| fingernail | (noun) the nail at the end of a finger | - |
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| flail | (noun) an implement consisting of handle with a free swinging stick at the end; used in manual threshing | - |
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| flickertail | (noun) of sagebrush and grassland areas of western United States and Canada | Synonyms: Citellus richardsoni, Richardson ground squirrel |
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| fluorouracil | (noun) an antimetabolite used to treat certain cancers | - |
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| foil | (noun) a light slender flexible sword tipped by a button | - |
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| (noun) a piece of thin and flexible sheet metal | - |
| (noun) picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector | Synonyms: transparency |
| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: hydrofoil |
| (noun) anything that serves by contrast to call attention to another thing's good qualities | Synonyms: enhancer |
| foresail | (noun) the lowest sail on the foremast of a square-rigged vessel | - |
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| fossil | (noun) the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil | - |
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| (noun) someone whose style is out of fashion | Synonyms: dodo, fogey, fogy |
| foxtail | (noun) grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes | Synonyms: foxtail grass |
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| frail | (noun) a basket for holding dried fruit (especially raisins or figs) | - |
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| (noun) the weight of a frail (basket) full of raisins or figs; between 50 and 75 pounds | - |
| freemail | (noun) a service providing free email delivery in exchange for exposure to advertising | - |
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| freetail | (noun) small swift insectivorous bat with leathery ears and a long tail; common in warm regions | Synonyms: free-tailed bat, freetailed bat |
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| fusil | (noun) a light flintlock musket | - |
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| gaffsail | (noun) a quadrilateral fore-and-aft sail suspended from a gaff | Synonyms: gaff-headed sail |
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| garboil | (noun) a state of commotion and noise and confusion | Synonyms: tumult, tumultuousness, uproar |
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| gemfibrozil | (noun) medication (trade name Lopid) used to lower the levels of triglyceride in the blood | Synonyms: Lopid |
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| gerbil | (noun) small Old World burrowing desert rodent with long soft pale fur and hind legs adapted for leaping | Synonyms: gerbille |
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| grail | (noun) (legend) chalice used by Christ at the Last Supper | Synonyms: Holy Grail, Sangraal |
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| (noun) the object of any prolonged endeavor | - |
| greenmail | (noun) (corporation) the practice of purchasing enough shares in a firm to threaten a takeover and thereby forcing the owners to buy those shares back at a premium in order to stay in business | - |
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| guardrail | (noun) a railing placed alongside a stairway or road for safety | Synonyms: safety rail |
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| gumboil | (noun) a boil or abscess on the gums | - |
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| hail | (noun) enthusiastic greeting | - |
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| (noun) many objects thrown forcefully through the air | - |
| (noun) precipitation of ice pellets when there are strong rising air currents | - |
| hairtail | (noun) long-bodied marine fishes having a long whiplike scaleless body and sharp teeth; closely related to snake mackerel | Synonyms: cutlassfish, frost fish |
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| halophil | (noun) archaebacteria requiring a salt-rich environment for growth and survival | Synonyms: halophile |
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| handrail | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, banister, bannister |
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| hangnail | (noun) a loose narrow strip of skin near the base of a fingernail; tearing it produces a painful sore that is easily infected | Synonyms: agnail |
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| headsail | (noun) any sail set forward of the foremast of a vessel | - |
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| hobnail | (noun) a short nail with a thick head; used to protect the soles of boots | - |
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| horsetail | (noun) perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in Northern Hemisphere; some in Africa and South America | - |
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| huamachil | (noun) common thorny tropical American tree having terminal racemes of yellow flowers followed by sickle-shaped or circinate edible pods and yielding good timber and a yellow dye and mucilaginous gum | Synonyms: camachile, manila tamarind, Pithecellobium dulce, wild tamarind |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: foil |
| jail | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jailhouse, pokey, poky, slammer |
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| jonquil | (noun) widely cultivated ornamental plant native to southern Europe but naturalized elsewhere having fragrant yellow or white clustered flowers | Synonyms: Narcissus jonquilla |
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| (noun) often used colloquially for any yellow daffodil | - |
| kail | (noun) coarse curly-leafed cabbage | Synonyms: cole, kale |
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| (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, cole, colewort, kale |
| kanchil | (noun) small chevrotain of southeastern Asia | Synonyms: Tragulus kanchil |
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| lentil | (noun) round flat seed of the lentil plant used for food | - |
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| (noun) widely cultivated Eurasian annual herb grown for its edible flattened seeds that are cooked like peas and also ground into meal and for its leafy stalks that are used as fodder | Synonyms: Lens culinaris, lentil plant |
| (noun) the fruit or seed of a lentil plant | - |