| 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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| (verb) descend by means of a rappel | Synonyms: rappel, rope down |
| 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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| (verb) be ill or unwell | - |
| (verb) cause bodily suffering to and make sick or indisposed | Synonyms: pain, trouble |
| 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 | - |
| (verb) send or transport by airmail | - |
| 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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| assail | (verb) attack in speech or writing | Synonyms: assault, attack, lash out, round, snipe |
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| (verb) attack someone physically or emotionally | Synonyms: assault, attack, set on |
| (verb) launch an attack or assault on; begin hostilities or start warfare with | Synonyms: attack |
| assoil | (verb) pronounce not guilty of criminal charges | Synonyms: acquit, clear, discharge, exculpate, exonerate |
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| avail | (noun) a means of serving | Synonyms: help, service |
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| (verb) take advantage of | - |
| (verb) take or use | Synonyms: help |
| (verb) be of use to, be useful to | - |
| 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 |
| (verb) remove (water) from a vessel with a container | - |
| (verb) empty (a vessel) by bailing | - |
| (verb) secure the release of (someone) by providing security | - |
| (verb) deliver something in trust to somebody for a special purpose and for a limited period | - |
| (verb) release after a security has been paid | - |
| 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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| bedevil | (verb) be confusing or perplexing to; cause to be unable to think clearly | Synonyms: befuddle, confound, confuse, discombobulate, fox, fuddle, throw |
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| (verb) treat cruelly | Synonyms: crucify, dun, frustrate, rag, torment |
| bewail | (verb) regret strongly | Synonyms: bemoan, deplore, lament |
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| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| (verb) obtain through threats | - |
| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| bobtail | (adjective) having a short or shortened tail | Synonyms: bobtailed |
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| (noun) a short or shortened tail of certain animals | Synonyms: bob, dock |
| (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 |
| (verb) immerse or be immersed in a boiling liquid, often for cooking purposes | - |
| (verb) come to the boiling point and change from a liquid to vapor | - |
| (verb) bring to, or maintain at, the boiling point | - |
| (verb) be in an agitated emotional state | Synonyms: seethe |
| (verb) be agitated | Synonyms: churn, moil, roil |
| 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 | - |
| (verb) haul fish aboard with brails | - |
| (verb) take in a sail with a brail | - |
| 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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| (verb) cook under a broiler | Synonyms: oven broil |
| (verb) heat by a natural force | Synonyms: bake |
| (verb) be very hot, due to hot weather or exposure to the sun | Synonyms: bake |
| 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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| (verb) raise trivial objections | Synonyms: carp, chicane |
| 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 |
| civil | (adjective) not rude; marked by satisfactory (or especially minimal) adherence to social usages and sufficient but not noteworthy consideration for others | Synonyms: polite |
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| (adjective) (of divisions of time) legally recognized in ordinary affairs of life | - |
| (adjective) of or relating to or befitting citizens as individuals | Synonyms: civic |
| (adjective) of or occurring within the state or between or among citizens of the state | - |
| (adjective) applying to ordinary citizens as contrasted with the military | - |
| (adjective) of or in a condition of social order | - |
| 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 |
| (verb) wind around something in coils or loops | Synonyms: curl, loop |
| (verb) make without a potter's wheel | Synonyms: hand-build, handbuild |
| (verb) to wind or move in a spiral course | Synonyms: gyrate, spiral |
| 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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| countervail | (verb) oppose and mitigate the effects of by contrary actions | Synonyms: counteract, counterbalance, neutralize |
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| (verb) compensate for or counterbalance | Synonyms: offset |
| 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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| curtail | (verb) place restrictions on | Synonyms: curb, cut back, restrict |
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| (verb) terminate or abbreviate before its intended or proper end or its full extent | Synonyms: clip, cut short |
| 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 | (adjective) presumptuously daring | Synonyms: temerarious |
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| (noun) a reckless impetuous irresponsible person | Synonyms: harum-scarum, hothead, lunatic, madcap, swashbuckler |
| derail | (verb) run off or leave the rails | Synonyms: jump |
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| (verb) cause to run off the tracks | - |
| despoil | (verb) destroy and strip of its possession | Synonyms: plunder, rape, spoil, violate |
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| (verb) steal goods; take as spoils | Synonyms: foray, loot, pillage, plunder, ransack, reave, rifle, strip |
| 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 |
| (verb) assign to a specific task | - |
| (verb) provide details for | - |
| 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 |
| (verb) coat or stuff with a spicy paste | - |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, chafe, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex |
| disembroil | (verb) free from involvement or entanglement | Synonyms: disentangle, disinvolve |
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| distil | (verb) give off (a liquid) | Synonyms: distill |
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| (verb) undergo the process of distillation | Synonyms: distill |
| (verb) extract by the process of distillation | Synonyms: distill, extract |
| (verb) undergo condensation; change from a gaseous to a liquid state and fall in drops | Synonyms: condense, distill |
| (verb) remove impurities from, increase the concentration of, and separate through the process of distillation | Synonyms: distill, make pure, purify, sublimate |
| 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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| (verb) fit together tightly, as if by means of a dovetail | - |
| 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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| (verb) communicate electronically on the computer | Synonyms: e-mail, netmail |
| embroil | (verb) force into some kind of situation, condition, or course of action | Synonyms: drag, drag in, sweep, sweep up, tangle |
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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 | - |
| (verb) limit the inheritance of property to a specific class of heirs | Synonyms: fee-tail |
| (verb) impose, involve, or imply as a necessary accompaniment or result | Synonyms: implicate |
| (verb) have as a logical consequence | Synonyms: imply, mean |
| eosinophil | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophile |
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| evil | (adjective) morally bad or wrong | - |
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| (adjective) having or exerting a malignant influence | Synonyms: malefic, malevolent, malign |
| (adjective) having the nature of vice | Synonyms: vicious |
| (noun) morally objectionable behavior | Synonyms: immorality, iniquity, wickedness |
| (noun) the quality of being morally wrong in principle or practice | Synonyms: evilness |
| fail | (verb) stop operating or functioning | Synonyms: break, break down, conk out, die, give out, give way, go, go bad |
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| (verb) deteriorate | - |
| (verb) prove insufficient | Synonyms: give out, run out |
| (verb) disappoint, prove undependable to; abandon, forsake | Synonyms: betray |
| (verb) become bankrupt or insolvent; fail financially and close | - |
| (verb) be unsuccessful | Synonyms: go wrong, miscarry |
| (verb) fail to get a passing grade | Synonyms: bomb, flunk, flush it |
| (verb) fail to do something; leave something undone | Synonyms: neglect |
| (verb) judge unacceptable | - |
| (verb) be unable | - |
| (verb) fall short in what is expected | - |
| 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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| fishtail | (verb) slow down by moving the tail sideways | - |
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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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| (verb) give a thrashing to; beat hard | Synonyms: lam, thrash, thresh |
| (verb) move like a flail; thresh about | Synonyms: thresh |
| 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 |
| (verb) cover or back with foil | - |
| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, bilk, cross, frustrate, queer, scotch, spoil, thwart |
| (verb) enhance by contrast | - |
| foresail | (noun) the lowest sail on the foremast of a square-rigged vessel | - |
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| fossil | (adjective) characteristic of a fossil | - |
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| (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 | - |
| (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 | (adjective) physically weak | - |
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| (adjective) easily broken or damaged or destroyed | Synonyms: delicate, fragile |
| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, imperfect, weak |
| (noun) a basket for holding dried fruit (especially raisins or figs) | - |
| (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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| fulfil | (verb) fill, satisfy or meet a want or need or condition or restriction | Synonyms: conform to, fill, fit, fulfill, meet, satisfy |
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| (verb) put in effect | Synonyms: accomplish, action, carry out, carry through, execute, fulfill |
| (verb) meet the requirements or expectations of | Synonyms: fulfill, live up to, satisfy |
| 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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