| heartsease | (noun) the absence of mental stress or anxiety | Synonyms: ataraxis, peace, peace of mind, peacefulness, repose, serenity |
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| (noun) common Old World viola with creamy often violet-tinged flowers | Synonyms: field pansy, Viola arvensis |
| (noun) violet of Pacific coast of North America having white petals tinged with yellow and deep violet | Synonyms: two-eyed violet, Viola ocellata |
| (noun) a common and long cultivated European herb from which most common garden pansies are derived | Synonyms: Johnny-jump-up, love-in-idleness, pink of my John, Viola tricolor, wild pansy |
| heliopause | (noun) the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet | - |
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| henhouse | (noun) a farm building for housing poultry | Synonyms: chicken coop, coop, hencoop |
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| heptose | (noun) a monosaccharide with seven carbon atoms. | - |
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| hexose | (noun) a monosaccharide that contains six carbon atoms per molecule | - |
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| histaminase | (noun) enzyme that acts as a catalyst in converting histidine to histamine | - |
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| hobbyhorse | (noun) a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride | Synonyms: hobby, rocking horse |
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| (noun) a topic to which one constantly reverts | - |
| hollandaise | (noun) eggs and butter with lemon juice | - |
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| hooknose | (noun) a nose with a prominent slightly aquiline bridge | Synonyms: Roman nose |
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| horse | (noun) solid-hoofed herbivorous quadruped domesticated since prehistoric times | Synonyms: Equus caballus |
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| (noun) a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa) | Synonyms: knight |
| (noun) a framework for holding wood that is being sawed | Synonyms: buck, sawbuck, sawhorse |
| (noun) a padded gymnastic apparatus on legs | Synonyms: gymnastic horse |
| (noun) troops trained to fight on horseback | Synonyms: cavalry, horse cavalry |
| hose | (noun) socks and stockings and tights collectively (the British include underwear) | Synonyms: hosiery |
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| (noun) a flexible pipe for conveying a liquid or gas | Synonyms: hosepipe |
| (noun) man's close-fitting garment of the 16th and 17th centuries covering the legs and reaching up to the waist; worn with a doublet | - |
| hothouse | (noun) a greenhouse in which plants are arranged in a pleasing manner | Synonyms: conservatory, indoor garden |
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| house | (noun) play in which children take the roles of father or mother or children and pretend to interact like adults | - |
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| (noun) a dwelling that serves as living quarters for one or more families | - |
| (noun) a building in which something is sheltered or located | - |
| (noun) a building where theatrical performances or motion-picture shows can be presented | Synonyms: theater, theatre |
| (noun) aristocratic family line | - |
| (noun) the members of a business organization that owns or operates one or more establishments | Synonyms: business firm, firm |
| (noun) an official assembly having legislative powers | - |
| (noun) the audience gathered together in a theatre or cinema | - |
| (noun) the members of a religious community living together | - |
| (noun) a social unit living together | Synonyms: family, home, household, menage |
| (noun) the management of a gambling house or casino | - |
| (noun) (astrology) one of 12 equal areas into which the zodiac is divided | Synonyms: mansion, planetary house, sign, sign of the zodiac, star sign |
| hyaluronidase | (noun) an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids | Synonyms: Hyazyme, spreading factor |
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| hydroisohypse | (noun) a line on a map connecting points of equal level on the piezometric surface. | - |
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| hypotenuse | (noun) the side of a right triangle opposite the right angle | - |
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| icehouse | (noun) a house for storing ice | - |
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| idocrase | (noun) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone | Synonyms: vesuvian, vesuvianite |
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| impasse | (noun) a street with only one way in or out | Synonyms: blind alley, cul de sac, dead-end street |
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| (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, deadlock, stalemate, standstill |
| impulse | (noun) the act of applying force suddenly | Synonyms: impetus, impulsion |
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| (noun) an impelling force or strength | Synonyms: momentum |
| (noun) the electrical discharge that travels along a nerve fiber | Synonyms: nerve impulse, nervous impulse, neural impulse |
| (noun) (electronics) a sharp transient wave in the normal electrical state (or a series of such transients) | Synonyms: pulsation, pulse, pulsing |
| (noun) a sudden desire | Synonyms: caprice, whim |
| (noun) an instinctive motive | Synonyms: urge |
| incense | (noun) the pleasing scent produced when incense is burned | - |
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| (noun) a substance that produces a fragrant odor when burned | - |
| increase | (noun) the act of increasing something | Synonyms: step-up |
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| (noun) the amount by which something increases | Synonyms: increment |
| (noun) a change resulting in an increase | - |
| (noun) a process of becoming larger or longer or more numerous or more important | Synonyms: growth, increment |
| (noun) a quantity that is added | Synonyms: addition, gain |
| innocense | (noun) white and lavender to pale-blue flowers grow in perfect rings of widely spaced bands around the stems forming a kind of pagoda; California | Synonyms: Collinsia bicolor, Collinsia heterophylla, purple chinese houses |
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| intercourse | (noun) sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur | Synonyms: carnal knowledge, coition, coitus, copulation, relation, sex act, sexual congress, sexual intercourse, sexual relation |
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| (noun) communication between individuals | Synonyms: social intercourse |
| inverse | (noun) something inverted in sequence or character or effect | Synonyms: opposite |
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| invertase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: saccharase, sucrase |
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| isobase | (noun) a line drawn on a map or chart connecting places of equal or constant land upheaval. | - |
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| isomerase | (noun) an enzyme that catalyzes its substrate to an isomeric form | - |
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| jailhouse | (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, jail, pokey, poky, slammer |
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| journalese | (noun) the style in which newspapers are written | - |
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| ketoheptose | (noun) A seven-carbon sugar possessing a ketone group. | - |
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| ketohexose | (noun) a monosaccharide having six carbon atoms and a ketone group | - |
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| ketose | (noun) any monosaccharide sugar that contains a ketone group or its hemiacetal | - |
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| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| ketotriose | (noun) Any ketose having three carbon atoms; in reality, only dihydroxyacetone. | - |
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| kinase | (noun) an enzyme that catalyzes the conversion of a proenzyme to an active enzyme | - |
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| lacrosse | (noun) a game invented by American Indians; now played by two teams who use long-handled rackets to catch and carry and throw the ball toward the opponents' goal | - |
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| lactase | (noun) any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose | Synonyms: Lactaid |
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| lactose | (noun) a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk | Synonyms: milk sugar |
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| laevulose | (noun) a simple sugar found in honey and in many ripe fruits | Synonyms: fructose, fruit sugar, levulose |
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| lamphouse | (noun) housing that holds a lamp (as in a movie projector) | Synonyms: lamp house, lamp housing |
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| lapse | (noun) a mistake resulting from inattention | Synonyms: oversight |
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| (noun) a failure to maintain a higher state | Synonyms: backsliding, lapsing, relapse, relapsing, reversion, reverting |
| (noun) a break or intermission in the occurrence of something | - |
| largesse | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, magnanimity, munificence, openhandedness |
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| (noun) a gift or money given (as for service or out of benevolence); usually given ostentatiously | Synonyms: largess |
| lease | (noun) a contract granting use or occupation of property during a specified time for a specified payment | - |
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| (noun) property that is leased or rented out or let | Synonyms: letting, rental |
| (noun) the period of time during which a contract conveying property to a person is in effect | Synonyms: term of a contract |
| legalese | (noun) a style that uses the abstruse technical vocabulary of the law | - |
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| lense | (noun) a transparent optical device used to converge or diverge transmitted light and to form images | Synonyms: lens, lens system |
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| levulose | (noun) a simple sugar found in honey and in many ripe fruits | Synonyms: fructose, fruit sugar, laevulose |
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| license | (noun) the act of giving a formal (usually written) authorization | Synonyms: permission, permit |
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| (noun) a legal document giving official permission to do something | Synonyms: licence, permit |
| (noun) freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech) | Synonyms: licence |
| (noun) excessive freedom; lack of due restraint | Synonyms: licence |
| lighthouse | (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon, beacon light, pharos |
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| lipase | (noun) an enzyme secreted in the digestive tract that catalyzes the breakdown of fats into individual fatty acids that can be absorbed into the bloodstream | - |
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| lobscouse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscuse, scouse |
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| lobscuse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscouse, scouse |
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| louse | (noun) wingless usually flattened bloodsucking insect parasitic on warm-blooded animals | Synonyms: sucking louse |
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| (noun) any of several small insects especially aphids that feed by sucking the juices from plants | Synonyms: plant louse |
| (noun) wingless insect with mouth parts adapted for biting; mostly parasitic on birds | Synonyms: bird louse, biting louse |
| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, insect, worm |
| lowercase | (noun) the characters that were once kept in bottom half of a compositor's type case | Synonyms: lower-case letter, minuscule, small letter |
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| madhouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, nut house, nuthouse, sanatorium, snake pit |
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| malaise | (noun) physical discomfort (as mild sickness or depression) | Synonyms: unease, uneasiness |
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| maltose | (noun) a white crystalline sugar formed during the digestion of starches | Synonyms: malt sugar |
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| manganese | (noun) a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals | Synonyms: atomic number 25, Mn |
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| manse | (noun) the residence of a clergyman (especially a Presbyterian clergyman) | - |
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| (noun) a large and imposing house | Synonyms: hall, mansion, mansion house, residence |
| marquise | (noun) permanent canopy over an entrance of a hotel etc. | Synonyms: marquee |
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| (noun) a noblewoman ranking below a duchess and above a countess | Synonyms: marchioness |
| masse | (noun) a shot in billiards made by hitting the cue ball with the cue held nearly vertically; the cue ball spins around another ball before hitting the object ball | Synonyms: masse shot |
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| masseuse | (noun) a female massager | - |
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| mayonnaise | (noun) egg yolks and oil and vinegar | Synonyms: mayo |
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| meetinghouse | (noun) a building for religious assembly (especially Nonconformists, e.g., Quakers) | Synonyms: conventicle |
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| megadose | (noun) an exceptionally large dose, as of a drug or vitamin. | - |
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| menopause | (noun) the time in a woman's life in which the menstrual cycle ends | Synonyms: change of life, climacteric |
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| merchandise | (noun) items for sale to the individual consumer | Synonyms: product, ware |
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| (noun) branded products meant to promote another product, especially films and pop groups | Synonyms: merchandising |
| metaphase | (noun) the second stage of mitosis | - |
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| (noun) the second stage of meiosis | - |
| misuse | (noun) improper or excessive use | Synonyms: abuse |
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| mongoose | (noun) agile grizzled Old World viverrine; preys on snakes and rodents | - |
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| monosaccharose | (noun) a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates | Synonyms: monosaccharide, simple sugar |
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| moose | (noun) large northern deer with enormous flattened antlers in the male; called `elk' in Europe and `moose' in North America | Synonyms: Alces alces, elk |
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| mortise | (noun) a square hole made to receive a tenon and so to form a joint | Synonyms: mortice |
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| motherese | (noun) an adult's imitation of the speech of a young child | Synonyms: baby talk, babytalk |
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| mouse | (noun) any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails | - |
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| (noun) a hand-operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; on the bottom of the device is a ball that rolls on the surface of the pad | Synonyms: computer mouse |
| (noun) person who is quiet or timid | - |
| (noun) a swollen bruise caused by a blow to the eye | Synonyms: black eye, shiner |
| mousse | (noun) toiletry consisting of an aerosol foam used in hair styling | Synonyms: hair mousse |
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| (noun) a light creamy dish made from fish or meat and set with gelatin | - |
| (noun) a rich, frothy, creamy dessert made with whipped egg whites and heavy cream | - |
| muramidase | (noun) an enzyme found in saliva and sweat and tears that destroys the cell walls of certain bacteria | Synonyms: lysozyme |
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| muse | (noun) the source of an artist's inspiration | - |
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| nitrocellulose | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocotton |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| noblesse | (noun) members of the nobility (especially of the French nobility) | - |
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| (noun) the state of being of noble birth | Synonyms: nobility |
| noise | (noun) the quality of lacking any predictable order or plan | Synonyms: haphazardness, randomness, stochasticity |
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| (noun) incomprehensibility resulting from irrelevant information or meaningless facts or remarks | - |
| (noun) the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience | Synonyms: dissonance, racket |
| (noun) a loud outcry of protest or complaint | - |
| (noun) sound of any kind (especially unintelligible or dissonant sound) | - |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, interference |
| nonsense | (noun) ornamental objects of no great value | Synonyms: falderol, folderal, frill, gimcrack, gimcrackery, trumpery |
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| (noun) a message that seems to convey no meaning | Synonyms: bunk, hokum, meaninglessness, nonsensicality |
| noose | (noun) a trap for birds or small mammals; often has a slip noose | Synonyms: gin, snare |
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| (noun) a loop formed in a cord or rope by means of a slipknot; it binds tighter as the cord or rope is pulled | Synonyms: running noose, slip noose |
| nose | (noun) a front that resembles a human nose (especially the front of an aircraft) | - |
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| (noun) a projecting spout from which a fluid is discharged | Synonyms: nozzle |
| (noun) the front or forward projection of a tool or weapon | - |
| (noun) the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals | Synonyms: olfactory organ |
| (noun) the sense of smell (especially in animals) | - |
| (noun) a natural skill | - |
| (noun) a symbol of inquisitiveness | - |
| (noun) a small distance | - |
| notecase | (noun) a pocket-size case for holding papers and paper money | Synonyms: billfold, pocketbook, wallet |
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| nuclease | (noun) general term for enzymes that catalyze the hydrolysis of nucleic acid by cleaving chains of nucleotides into smaller units | - |
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| nurse | (noun) one skilled in caring for young children or the sick (usually under the supervision of a physician) | - |
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| (noun) a woman who is the custodian of children | Synonyms: nanny, nursemaid |
| nutcase | (noun) someone deranged and possibly dangerous | Synonyms: crazy, looney, loony, weirdo |
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| nuthouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, sanatorium, snake pit |
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| obverse | (noun) the side of a coin or medal bearing the principal stamp or design | - |
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| (noun) the more conspicuous of two alternatives or cases or sides | - |
| offense | (noun) the action of attacking an enemy | Synonyms: offence, offensive |
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| (noun) a transgression that constitutes a violation of what is judged to be right | Synonyms: offence |
| (noun) a lack of politeness; a failure to show regard for others; wounding the feelings of others | Synonyms: discourtesy, offence, offensive activity |
| (noun) a feeling of anger caused by being offended | Synonyms: offence, umbrage |
| (noun) the team that has the ball (or puck) and is trying to score | Synonyms: offence |
| officialese | (noun) the style of writing characteristic of some government officials: formal and obscure | - |
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| oligoclase | (noun) any of a series of triclinic feldspars that form rocks | Synonyms: plagioclase |
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| orthoclase | (noun) a white or colored monoclinic feldspar | - |
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| outercourse | (noun) sexual stimulation without vaginal penetration | - |
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| outhouse | (noun) a small outbuilding with a bench having holes through which a user can defecate | Synonyms: earth-closet, jakes, privy |
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| overpraise | (noun) excessive or undeserved praise. | - |
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| overuse | (noun) exploitation to the point of diminishing returns | Synonyms: overexploitation, overutilisation, overutilization |
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| oxidase | (noun) any of the enzymes that catalyze biological oxidation | - |
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