| preexist | (verb) exist beforehand or prior to a certain point in time | - |
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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 | (adjective) of or relating to or characterized by propaganda | Synonyms: propagandistic |
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| (noun) a person who disseminates messages calculated to assist some cause or some government | - |
| 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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| 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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| 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 | (adjective) discriminatory especially on the basis of race or religion | Synonyms: anti-Semite, antiblack |
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| (adjective) based on racial intolerance | - |
| (noun) a person with a prejudiced belief that one racial group is superior to others | Synonyms: racialist |
| 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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| rapist | (noun) someone who forces another to have sexual intercourse | Synonyms: raper |
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| rationalist | (adjective) of or relating to or characteristic of rationalism | - |
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| (noun) someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes | Synonyms: positivist |
| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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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 | - |
| receptionist | (noun) a secretary whose main duty is to answer the telephone and receive visitors | - |
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| recidivist | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: backslider, reversionist |
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| (noun) someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior) | Synonyms: habitual criminal, repeater |
| recitalist | (noun) a musician who gives recitals | - |
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| reductionist | (adjective) of or relating to the theory of reductionism | - |
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| reformist | (adjective) favoring or promoting reform (often by government action) | Synonyms: progressive, reform-minded |
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| (noun) a disputant who advocates reform | Synonyms: crusader, meliorist, reformer, social reformer |
| religionist | (noun) a person addicted to religion or a religious zealot | - |
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| reservist | (noun) a member of a military reserve | - |
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| resist | (verb) stand up or offer resistance to somebody or something | Synonyms: hold out, stand firm, withstand |
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| (verb) withstand the force of something | Synonyms: fend, stand |
| (verb) refuse to comply | Synonyms: balk, baulk, jib |
| (verb) express opposition through action or words | Synonyms: dissent, protest |
| (verb) elude, especially in a baffling way | Synonyms: defy, refuse |
| (verb) resist immunologically the introduction of some foreign tissue or organ | Synonyms: refuse, reject |
| reversionist | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: backslider, recidivist |
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| revisionist | (noun) a Communist who tries to rewrite Marxism to justify a retreat from the revolutionary position | - |
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| revivalist | (noun) a preacher of the Christian gospel | Synonyms: evangelist, gospeler, gospeller |
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| revolutionist | (noun) a radical supporter of political or social revolution | Synonyms: revolutionary, subversive, subverter |
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| rheumatologist | (noun) a physician specializing in rheumatic diseases | - |
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| rhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, otorhinolaryngologist |
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| rightist | (adjective) believing in or supporting tenets of the political right | Synonyms: right-wing |
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| (noun) a member of a right wing political party | Synonyms: right-winger |
| ritualist | (noun) an advocate of strict observance of ritualistic forms | - |
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| (noun) a social anthropologist who is expert on rites and ceremonies | - |
| romanticist | (adjective) belonging to or characteristic of Romanticism or the Romantic Movement in the arts | Synonyms: romantic, romanticistic |
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| (noun) an artist of the Romantic Movement or someone influenced by Romanticism | Synonyms: romantic |
| (noun) someone who indulges in excessive sentimentality | Synonyms: sentimentalist |
| royalist | (noun) an advocate of the principles of monarchy | Synonyms: monarchist |
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| ruralist | (noun) an advocate of rural living | - |
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| (noun) a man who lives in the country and has country ways | Synonyms: countryman |
| sadist | (noun) someone who obtains pleasure from inflicting pain on others | - |
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| sadomasochist | (noun) someone who enjoys both sadism and masochism | - |
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| satirist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ironist, ridiculer |
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| saxist | (noun) a musician who plays the saxophone | Synonyms: saxophonist |
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| saxophonist | (noun) a musician who plays the saxophone | Synonyms: saxist |
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| scenarist | (noun) a writer of screenplays | - |
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| schist | (noun) any metamorphic rock that can be split into thin layers | - |
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| scientist | (noun) a person with advanced knowledge of one or more sciences | - |
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| sciolist | (noun) an amateur who engages in an activity without serious intentions and who pretends to have knowledge | Synonyms: dabbler, dilettante |
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| secessionist | (noun) an advocate of secessionism | - |
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| sectarist | (noun) a member of a sect | Synonyms: sectarian, sectary |
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| secularist | (noun) an advocate of secularism; someone who believes that religion should be excluded from government and education | - |
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| segregationist | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregator |
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| seismologist | (noun) a geophysicist who studies earthquakes and the mechanical characteristics of the Earth | - |
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| semanticist | (noun) a specialist in the study of meaning | Synonyms: semiotician |
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| semifinalist | (noun) one of four competitors remaining in a tournament by elimination | - |
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| seminarist | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarian |
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| sensationalist | (noun) someone who uses exaggerated or lurid material in order to gain public attention | Synonyms: ballyhoo artist |
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| sensualist | (noun) a person who enjoys sensuality | - |
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| sentimentalist | (noun) someone who indulges in excessive sentimentality | Synonyms: romanticist |
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| separationist | (noun) an advocate of secession or separation from a larger group (such as an established church or a national union) | Synonyms: separatist |
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| separatist | (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, fissiparous |
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| (noun) an advocate of secession or separation from a larger group (such as an established church or a national union) | Synonyms: separationist |
| sericulturist | (noun) a producer of raw silk | - |
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| serologist | (noun) a medical scientist who specializes in serology | - |
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| sexist | (adjective) discriminatory on the basis of sex (usually said of men's attitude toward women) | - |
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| (noun) a man with a chauvinistic belief in the inferiority of women | Synonyms: male chauvinist |
| shamanist | (adjective) of or relating to shamanism | Synonyms: shamanistic |
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| shirtwaist | (noun) a blouse with buttons down the front | Synonyms: shirtwaister |
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| shitlist | (noun) a list of people who are out of favor | Synonyms: black book, blacklist |
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| shortlist | (noun) a list of applicants winnowed from a longer list who have been deemed suitable and from which the successful person will be chosen | Synonyms: short list |
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| (verb) put someone or something on a short list | - |
| socialist | (adjective) advocating or following the socialist principles | Synonyms: socialistic |
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| (noun) a political advocate of socialism | - |
| sociobiologist | (noun) a biologist who studies the biological determinants of social behavior | - |
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| sociolinguist | (noun) a linguist who studies the social and cultural factors that influence linguistic communication | - |
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| sociologist | (noun) a social scientist who studies the institutions and development of human society | - |
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| sodalist | (noun) a member of a sodality | - |
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| sodomist | (noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male) | Synonyms: bugger, sod, sodomite |
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| soloist | (noun) a musician who performs a solo | - |
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| somnambulist | (noun) someone who walks about in their sleep | Synonyms: noctambulist, sleepwalker |
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| somniloquist | (noun) someone who talks while asleep | - |
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| sophist | (noun) someone whose reasoning is subtle and often specious | Synonyms: casuist |
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| specialist | (noun) an expert who is devoted to one occupation or branch of learning | Synonyms: specialiser, specializer |
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| (noun) practices one branch of medicine | Synonyms: medical specialist |
| spelaeologist | (noun) a person who explores caves | Synonyms: potholer, speleologist, spelunker |
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| speleologist | (noun) a person who explores caves | Synonyms: potholer, spelaeologist, spelunker |
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| spiritualist | (adjective) of or relating to or connected with spiritualism | Synonyms: spiritualistic |
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| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, sensitive |
| stigmatist | (noun) a person whose body is marked by religious stigmata (such as marks resembling the wounds of the crucified Christ) | Synonyms: stigmatic |
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