| larcenist | (noun) a person who commits larceny | Synonyms: larcener |
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| leftist | (noun) a person who belongs to the political left | Synonyms: collectivist, left-winger |
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| lepidopterist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterologist |
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| lepidopterologist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterist |
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| lexicologist | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicographer |
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| liberalist | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberal, progressive |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| limnologist | (noun) a specialist in the study of freshwater ponds and lakes | - |
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| linguist | (noun) a person who speaks more than one language | Synonyms: polyglot |
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| (noun) a specialist in linguistics | Synonyms: linguistic scientist |
| list | (noun) the property possessed by a line or surface that departs from the vertical | Synonyms: inclination, lean, leaning, tilt |
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| (noun) a database containing an ordered array of items (names or topics) | Synonyms: listing |
| liturgist | (noun) an authority on liturgies | - |
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| lobbyist | (noun) someone who is employed to persuade legislators to vote for legislation that favors the lobbyist's employer | - |
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| logomachist | (noun) someone given to disputes over words | Synonyms: logomach |
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| loyalist | (noun) a person who is loyal to their allegiance (especially in times of revolt) | Synonyms: stalwart |
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| lutanist | (noun) a musician who plays the lute | Synonyms: lutenist, lutist |
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| lutenist | (noun) a musician who plays the lute | Synonyms: lutanist, lutist |
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| lutist | (noun) a musician who plays the lute | Synonyms: lutanist, lutenist |
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| lyricist | (noun) a person who writes the words for songs | Synonyms: lyrist |
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| lyrist | (noun) a person who writes the words for songs | Synonyms: lyricist |
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| machinist | (noun) a craftsman skilled in operating machine tools | Synonyms: mechanic, shop mechanic |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| madrigalist | (noun) a singer of madrigals | - |
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| malacologist | (noun) a zoologist specializing in the study of mollusks | - |
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| mammalogist | (noun) one skilled in the study of mammals | - |
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| manicurist | (noun) a beautician who cleans and trims and polishes the fingernails | - |
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| masochist | (noun) someone who obtains pleasure from receiving punishment | - |
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| materialist | (noun) someone who thinks that nothing exists but physical matter | - |
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| (noun) someone with great regard for material possessions | - |
| mechanist | (noun) a philosopher who subscribes to the doctrine of mechanism | - |
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| medalist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medallist |
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| (noun) someone who has won a medal | Synonyms: medallist |
| medallist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medalist |
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| (noun) someone who has won a medal | Synonyms: medalist |
| meliorist | (noun) a disputant who advocates reform | Synonyms: crusader, reformer, reformist, social reformer |
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| mesmerist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, hypnotizer, mesmerizer |
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| metallurgist | (noun) an engineer trained in the extraction and refining and alloying and fabrication of metals | Synonyms: metallurgical engineer |
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| meteorologist | (noun) a specialist who studies processes in the earth's atmosphere that cause weather conditions | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microeconomist | (noun) an economist who specializes in microeconomics | Synonyms: microeconomic expert |
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| microscopist | (noun) a scientist who specializes in research with the use of microscopes | - |
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| militarist | (noun) a person who advocates war or warlike policies | Synonyms: warmonger |
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| millenarist | (noun) a person who believes in the coming of the millennium (a time of great peace and prosperity) | Synonyms: chiliast, millenarian |
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| mineralogist | (noun) a scientist trained in mineralogy | - |
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| miniaturist | (noun) someone who paints tiny pictures in great detail | - |
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| minimalist | (noun) a practitioner or advocate of artistic minimalism | - |
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| (noun) a conservative who advocates only minor reforms in government or politics | - |
| misanthropist | (noun) someone who dislikes people in general | Synonyms: misanthrope |
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| misogamist | (noun) a person who hates marriage | - |
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| misogynist | (noun) a misanthrope who dislikes women in particular | Synonyms: woman hater |
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| mist | (noun) a thin fog with condensation near the ground | - |
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| mixologist | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, barkeeper, bartender |
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| mnemonist | (noun) an expert in the use of mnemonics; someone able to perform unusual feats of memory | - |
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| 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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| 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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| 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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| 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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| neurobiologist | (noun) a specialist in neurobiology | - |
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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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| 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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| 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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| 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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