| moderationist | (noun) a person who takes a position in the political center | Synonyms: centrist, middle of the roader, moderate |
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| (noun) a moderate drinker (as opposed to a total abstainer) | - |
| modernist | (noun) an artist who makes a deliberate break with previous styles | - |
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| monarchist | (noun) an advocate of the principles of monarchy | Synonyms: royalist |
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| monetarist | (noun) an advocate of the theory that economic fluctuations are caused by increases or decreases in the supply of money | - |
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| monoblast | (noun) a large immature monocyte normally found in bone marrow | - |
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| monogamist | (noun) someone who practices monogamy (one spouse at a time) | Synonyms: monogynist |
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| monogynist | (noun) someone who practices monogamy (one spouse at a time) | Synonyms: monogamist |
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| monologist | (noun) an entertainer who performs alone | - |
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| monopolist | (noun) someone who monopolizes the means of producing or selling something | Synonyms: monopoliser, monopolizer |
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| monotheist | (noun) a believer in one god | - |
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| moralist | (noun) a philosopher who specializes in morals and moral problems | - |
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| (noun) someone who demands exact conformity to rules and forms | Synonyms: disciplinarian, martinet |
| motorcyclist | (noun) a traveler who rides a motorcycle | - |
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| motorist | (noun) someone who drives (or travels in) an automobile | Synonyms: automobilist |
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| muralist | (noun) a painter of murals | - |
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| musicologist | (noun) a student of musicology | - |
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| must | (noun) the quality of smelling or tasting old or stale or mouldy | Synonyms: moldiness, mustiness |
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| (noun) grape juice before or during fermentation | - |
| (noun) a necessary or essential thing | - |
| mycologist | (noun) a botanist who specializes in the study of fungi | - |
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| mycophagist | (noun) a person or animal who eats fungi (especially mushrooms) | Synonyms: mycophage |
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| myeloblast | (noun) a precursor of leukocytes that normally occurs only in bone marrow | - |
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| mythologist | (noun) an expert on mythology | - |
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| narcissist | (noun) someone in love with themselves | Synonyms: narcist |
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| narcist | (noun) someone in love with themselves | Synonyms: narcissist |
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| nationalist | (noun) one who loves and defends his or her country | Synonyms: patriot |
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| (noun) an advocate of national independence of or a strong national government | - |
| nativist | (noun) a philosopher who subscribes to nativism | - |
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| naturalist | (noun) a biologist knowledgeable about natural history (especially botany and zoology) | Synonyms: natural scientist |
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| (noun) an advocate of the doctrine that the world can be understood in scientific terms | - |
| naturist | (noun) a person who practices nudity for reasons of health or religion | Synonyms: nudist |
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| negativist | (noun) someone who is resigned to defeat without offering positive suggestions | Synonyms: defeatist |
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| (noun) someone who refuses to do what is asked or does the opposite of what is asked | - |
| neoclassicist | (noun) an advocate of neoclassicism | - |
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| neologist | (noun) a lexicographer of new words and expressions | - |
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| nepotist | (noun) a powerful person who shows favoritism to relatives or close friends | - |
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| nest | (noun) a kind of gun emplacement | - |
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| (noun) furniture pieces made to fit close together | - |
| (noun) a gang of people (criminals or spies or terrorists) assembled in one locality | - |
| (noun) a cosy or secluded retreat | - |
| (noun) a structure in which animals lay eggs or give birth to their young | - |
| neurobiologist | (noun) a specialist in neurobiology | - |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| neurolinguist | (noun) someone trained in neuroscience and linguistics who studies brain processes during language production and reception | - |
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| neurologist | (noun) a medical specialist in the nervous system and the disorders affecting it | Synonyms: brain doctor |
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| neuroscientist | (noun) a neurobiologist who specializes in the study of the brain | - |
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| neutralist | (noun) an advocate of neutrality in international affairs | - |
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| newscast | (noun) a broadcast of news or commentary on the news | - |
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| nihilist | (noun) an advocate of anarchism | Synonyms: anarchist, syndicalist |
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| (noun) someone who rejects all theories of morality or religious belief | - |
| noctambulist | (noun) someone who walks about in their sleep | Synonyms: sleepwalker, somnambulist |
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| nominalist | (noun) a philosopher who has adopted the doctrine of nominalism | - |
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| nonconformist | (noun) someone who refuses to conform to established standards of conduct | Synonyms: recusant |
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| northeast | (noun) a location in the northeastern part of a country, region, or city | - |
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| (noun) the compass point midway between north and east; at 45 degrees | Synonyms: NE, nor'-east, northeastward |
| (noun) the direction corresponding to the northeastward compass point | - |
| northwest | (noun) a location in the northwestern part of a country, region, or city | - |
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| (noun) the compass point midway between north and west; at 315 degrees | Synonyms: nor'-west, northwestward, NW |
| (noun) the direction corresponding to the northwestward compass point | - |
| novelist | (noun) one who writes novels | - |
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| nudist | (noun) a person who practices nudity for reasons of health or religion | Synonyms: naturist |
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| numerologist | (noun) a believer in numerology | - |
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| numismatist | (noun) a collector and student of money (and coins in particular) | Synonyms: coin collector, numismatologist |
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| numismatologist | (noun) a collector and student of money (and coins in particular) | Synonyms: coin collector, numismatist |
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| nutritionist | (noun) a specialist in the study of nutrition | - |
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| oast | (noun) a kiln for drying hops | - |
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| oboist | (noun) a musician who plays the oboe | - |
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| obscurantist | (noun) a person who is deliberately vague | - |
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| obstructionist | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructor, resister, thwarter |
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| occultist | (noun) a believer in occultism; someone versed in the occult arts | - |
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| oculist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, ophthalmologist |
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| (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: optometrist |
| odist | (noun) a poet who writes odes | - |
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| oenologist | (noun) a specialist in wine making | Synonyms: enologist, fermentologist |
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| onanist | (noun) a person who practices masturbation | Synonyms: masturbator |
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| oncologist | (noun) a specialist in oncology | - |
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| ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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| opportunist | (noun) a person who places expediency above principle | Synonyms: self-seeker |
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| optimist | (noun) a person disposed to take a favorable view of things | - |
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| optometrist | (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: oculist |
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| organist | (noun) a person who plays an organ | - |
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| orientalist | (noun) a specialist in oriental subjects | - |
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| ornamentalist | (noun) someone who decorates | Synonyms: decorator |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| orthodontist | (noun) a dentist specializing in the prevention or correction of irregularities of the teeth | - |
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| orthoepist | (noun) a practitioner of orthoepy (especially one of the 17th or 18th century scholars who proposed to reform English spelling so it would reflect pronunciation more closely) | - |
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| orthopaedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopedist |
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| orthopedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopaedist |
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| orthoptist | (noun) a specialist in orthoptics | - |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| osteologist | (noun) an anatomist who is skilled in osteology | Synonyms: osteologer |
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| osteopathist | (noun) a therapist who manipulates the skeleton and muscles | Synonyms: osteopath |
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| otolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otorhinolaryngologist, rhinolaryngologist |
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| otologist | (noun) a physician who specializes in the ear and its diseases | Synonyms: ear doctor, ear specialist |
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| otorhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, rhinolaryngologist |
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| outburst | (noun) a sudden violent disturbance | Synonyms: tumultuous disturbance |
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| (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, effusion, gush |
| (noun) a sudden intense happening | Synonyms: burst, flare-up |
| outcast | (noun) a person who is rejected (from society or home) | Synonyms: castaway, Ishmael, pariah |
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| outpost | (noun) a military post stationed at a distance from the main body of troops | - |
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| (noun) a settlement on the frontier of civilization | Synonyms: frontier settlement |
| (noun) a station in a remote or sparsely populated location | Synonyms: outstation |
| outthrust | (noun) an outcropping of rock that extends outward | - |
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| overcast | (noun) a cast that falls beyond the intended spot | - |
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| (noun) a long whipstitch or overhand stitch overlying an edge to prevent raveling | Synonyms: overcasting |
| (noun) the state of the sky when it is covered by clouds | Synonyms: cloud cover, cloudiness |
| (noun) gloomy semidarkness caused by cloud cover | Synonyms: cloudiness |
| pacificist | (noun) someone opposed to violence as a means of settling disputes | Synonyms: disarmer, pacifist |
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| pacifist | (noun) someone opposed to violence as a means of settling disputes | Synonyms: disarmer, pacificist |
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| paederast | (noun) a man who has sex (usually sodomy) with a boy as the passive partner | Synonyms: child molester, pederast |
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| palaeontologist | (noun) a specialist in paleontology | Synonyms: fossilist, paleontologist |
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| paleographist | (noun) an archeologist skilled in paleography | Synonyms: paleographer |
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| paleontologist | (noun) a specialist in paleontology | Synonyms: fossilist, palaeontologist |
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| palimpsest | (noun) a manuscript (usually written on papyrus or parchment) on which more than one text has been written with the earlier writing incompletely erased and still visible | - |
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| palmist | (noun) fortuneteller who predicts your future by the lines on your palms | Synonyms: chiromancer, palmister |
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| panegyrist | (noun) an orator who delivers eulogies or panegyrics | Synonyms: eulogist |
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| panelist | (noun) a member of a panel | Synonyms: panellist |
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| panellist | (noun) a member of a panel | Synonyms: panelist |
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| pantheist | (noun) someone who believes that God and the universe are the same | - |
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| pantomimist | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, mummer, pantomimer |
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| pantywaist | (noun) a timid man or boy considered childish or unassertive | Synonyms: milksop, Milquetoast, pansy, sissy |
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| papist | (noun) an offensive term for Roman Catholics; originally, a Roman Catholic who was a strong advocate of the papacy | - |
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