| parachutist | (noun) a person who jumps from aircraft using a parachute | Synonyms: parachute jumper, parachuter |
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| parapsychologist | (noun) someone who studies the evidence for such psychological phenomena as psychokinesis and telepathy and clairvoyance | - |
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| parodist | (noun) mimics literary or musical style for comic effect | Synonyms: lampooner |
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| partitionist | (noun) an advocate of partitioning a country | - |
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| past | (noun) a verb tense that expresses actions or states in the past | Synonyms: past tense |
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| (noun) the time that has elapsed | Synonyms: past times, yesteryear |
| (noun) a earlier period in someone's life (especially one that they have reason to keep secret) | - |
| pathologist | (noun) a doctor who specializes in medical diagnosis | Synonyms: diagnostician |
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| pederast | (noun) a man who has sex (usually sodomy) with a boy as the passive partner | Synonyms: child molester, paederast |
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| pediatrist | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrician |
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| pedodontist | (noun) a dentist who specializes in the care of children's teeth | - |
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| penologist | (noun) a person who studies the theory and practice of prison management | - |
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| percussionist | (noun) a musician who plays percussion instruments | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perinatologist | (noun) an obstetrician specializing in perinatology | - |
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| periodontist | (noun) a dentist specializing in diseases of the gums and other structure surrounding the teeth | - |
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| permafrost | (noun) ground that is permanently frozen | - |
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| pessimist | (noun) a person who expects the worst | - |
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| pest | (noun) any unwanted and destructive insect or other animal that attacks food or crops or livestock etc. | - |
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| (noun) a persistently annoying person | Synonyms: blighter, cuss, gadfly, pesterer |
| (noun) any epidemic disease with a high death rate | Synonyms: pestilence, plague |
| (noun) a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal | Synonyms: pestilence, pestis, plague |
| phalangist | (noun) a Spanish member of General Franco's political party | Synonyms: falangist |
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| pharmacist | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: apothecary, chemist, druggist, pill pusher, pill roller |
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| pharmacologist | (noun) someone trained in the science of drugs (their composition and uses and effects) | Synonyms: pharmaceutical chemist |
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| phenoplast | (noun) a thermosetting resin | Synonyms: phenolic, phenolic resin |
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| philanthropist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: altruist |
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| philatelist | (noun) a collector and student of postage stamps | Synonyms: stamp collector |
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| philhellenist | (noun) an admirer of Greece and everything Greek | Synonyms: Graecophile, philhellene |
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| philologist | (noun) a humanist specializing in classical scholarship | Synonyms: philologue |
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| phlebotomist | (noun) someone who practices phlebotomy | - |
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| phonologist | (noun) a specialist in phonology | - |
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| photojournalist | (noun) a journalist who presents a story primarily through the use of photographs | - |
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| photometrist | (noun) someone who practices photometry | Synonyms: photometrician |
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| phrenologist | (noun) someone who claims to be able to read your character from the shape of your skull | Synonyms: craniologist |
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| physicist | (noun) a scientist trained in physics | - |
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| physiologist | (noun) a biologist specializing in physiology | - |
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| physiotherapist | (noun) therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder | Synonyms: physical therapist |
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| phytochemist | (noun) a chemist who specializes in the chemistry of plants | - |
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| phytologist | (noun) a biologist specializing in the study of plants | Synonyms: botanist, plant scientist |
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| pianist | (noun) a person who plays the piano | Synonyms: piano player |
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| plagiarist | (noun) someone who uses another person's words or ideas as if they were his own | Synonyms: literary pirate, pirate, plagiariser, plagiarizer |
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| plasmablast | (noun) the precursor of a plasma cell | - |
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| playlist | (noun) a list of musical selections for performance or for broadcast by radio | Synonyms: play list |
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| pluralist | (noun) someone who believes that distinct ethnic or cultural or religious groups can exist together in society | - |
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| (noun) a philosopher who believes that no single explanation can account for all the phenomena of nature | - |
| (noun) a cleric who holds more than one benefice at a time | - |
| podiatrist | (noun) a specialist in care for the feet | Synonyms: chiropodist, foot doctor |
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| pointillist | (noun) a painter who uses the technique of pointillism | - |
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| polemicist | (noun) a writer who argues in opposition to others (especially in theology) | Synonyms: polemic, polemist |
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| polemist | (noun) a writer who argues in opposition to others (especially in theology) | Synonyms: polemic, polemicist |
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| poltergeist | (noun) a ghost that announces its presence with rapping and the creation of disorder | - |
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| polyandrist | (noun) a woman with two or more husbands | - |
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| polygamist | (noun) someone who is married to two or more people at the same time | - |
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| polygynist | (noun) a man with two or more wives | - |
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| polytheist | (noun) one who believes in a plurality of gods | - |
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| pomologist | (noun) someone versed in pomology or someone who cultivates fruit trees | - |
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| populist | (noun) someone who advocates the rights of the common people over those of the elite | - |
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| portraitist | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portrayer |
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| positivist | (noun) someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes | Synonyms: rationalist |
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| post | (noun) a job in an organization | Synonyms: berth, office, place, position, situation |
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| (noun) the delivery and collection of letters and packages | - |
| (noun) an upright consisting of a piece of timber or metal fixed firmly in an upright position | - |
| (noun) military installation at which a body of troops is stationed | Synonyms: military post |
| (noun) the system whereby messages are transmitted via the post office | Synonyms: mail, mail service, postal service |
| (noun) a pole or stake set up to mark something (as the start or end of a race track) | Synonyms: stake |
| (noun) A message on a social media website | - |
| (noun) any particular collection of letters or packages that is delivered | Synonyms: mail |
| (noun) the position where someone (as a guard or sentry) stands or is assigned to stand | Synonyms: station |
| pragmatist | (noun) a person who takes a practical approach to problems and is concerned primarily with the success or failure of their actions | - |
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| (noun) an adherent of philosophical pragmatism | - |
| predestinationist | (noun) anyone who submits to the belief that they are powerless to change their destiny | Synonyms: determinist, fatalist, predestinarian |
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| presentist | (noun) a theologian who believes that the Scripture prophecies of the Apocalypse (the Book of Revelation) are being fulfilled at the present time | - |
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| preservationist | (noun) someone who advocates the preservation of historical sites or endangered species or natural areas | - |
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| preterist | (noun) a theologian who believes that the Scripture prophecies of the Apocalypse (the Book of Revelation) have already been fulfilled | - |
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| priest | (noun) a clergyman in Christian churches who has the authority to perform or administer various religious rites; one of the Holy Orders | - |
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| (noun) a person who performs religious duties and ceremonies in a non-Christian religion | Synonyms: non-Christian priest |
| proctologist | (noun) a doctor specializing in diseases of the rectum and anus | - |
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| prohibitionist | (noun) a reformer who opposes the use of intoxicating beverages | Synonyms: dry |
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| projectionist | (noun) the person who operates the projector in a movie house | - |
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| propagandist | (noun) a person who disseminates messages calculated to assist some cause or some government | - |
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| prosthetist | (noun) an expert in prosthetics | - |
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| prosthodontist | (noun) a dentist who is expert in prosthodontics | - |
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| protagonist | (noun) a person who backs a politician or a team etc. | Synonyms: admirer, booster, champion, friend, supporter |
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| (noun) the principal character in a work of fiction | Synonyms: agonist |
| protectionist | (noun) an advocate of protectionism | - |
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| protest | (noun) the act of protesting; a public (often organized) manifestation of dissent | Synonyms: dissent, objection |
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| (noun) a formal and solemn declaration of objection | Synonyms: protestation |
| (noun) the act of making a strong public expression of disagreement and disapproval | - |
| protist | (noun) free-living or colonial organisms with diverse nutritional and reproductive modes | Synonyms: protistan |
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| protoctist | (noun) any of the unicellular protists | - |
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| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
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| protozoologist | (noun) a zoologist who studies protozoans | - |
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| provost | (noun) a high-ranking university administrator | - |
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| psalmist | (noun) a composer of sacred songs | - |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psychiatrist | (noun) a physician who specializes in psychiatry | Synonyms: head-shrinker, shrink |
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| psychoanalyst | (noun) a licensed practitioner of psychoanalysis | Synonyms: analyst |
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| psycholinguist | (noun) a person (usually a psychologist but sometimes a linguist) who studies the psychological basis of human language | - |
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| psychologist | (noun) a scientist trained in psychology | - |
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| psychophysicist | (noun) a psychologist trained in psychophysics | - |
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| psychotherapist | (noun) a therapist who deals with mental and emotional disorders | Synonyms: clinical psychologist |
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| pteridologist | (noun) an expert in the study of ferns | - |
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| publicist | (noun) someone who publicizes | Synonyms: publiciser, publicizer |
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| pugilist | (noun) someone who fights with his fists for sport | Synonyms: boxer |
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| purist | (noun) someone who insists on great precision and correctness (especially in the use of words) | - |
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| quest | (noun) the act of searching for something | Synonyms: seeking |
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| (noun) a search for an alternative that meets cognitive criteria | Synonyms: pursuance, pursuit |
| quietist | (noun) a religious mystic who follows quietism | - |
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| racialist | (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racist |
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| racist | (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racialist |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiochemist | (noun) a chemist who specializes in nuclear chemistry | Synonyms: nuclear chemist |
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| radiologist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiotherapist |
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| radiotherapist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiologist |
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| rainforest | (noun) a forest with heavy annual rainfall | Synonyms: rain forest |
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| rapist | (noun) someone who forces another to have sexual intercourse | Synonyms: raper |
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| rationalist | (noun) someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes | Synonyms: positivist |
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| realist | (noun) a philosopher who believes that universals are real and exist independently of anyone thinking of them | - |
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| (noun) a painter who represents the world realistically and not in an idealized or romantic style | - |
| (noun) a person who accepts the world as it literally is and deals with it accordingly | - |
| rebroadcast | (noun) a broadcast that repeated at a later time | - |
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| receptionist | (noun) a secretary whose main duty is to answer the telephone and receive visitors | - |
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