| 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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| 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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| 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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| 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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| 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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| 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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| pathologist | (noun) a doctor who specializes in medical diagnosis | Synonyms: diagnostician |
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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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| pessimist | (noun) a person who expects the worst | - |
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| 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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| 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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| 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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| 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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| 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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| 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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| protozoologist | (noun) a zoologist who studies protozoans | - |
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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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| 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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