| 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 | (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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| 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 | - |
| 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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| reformist | (noun) a disputant who advocates reform | Synonyms: crusader, meliorist, reformer, social reformer |
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| 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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| 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 | (noun) a member of a right wing political party | Synonyms: right-winger |
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| 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 | (noun) an artist of the Romantic Movement or someone influenced by Romanticism | Synonyms: romantic |
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| (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 | (noun) an advocate of secession or separation from a larger group (such as an established church or a national union) | Synonyms: separationist |
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| 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 | (noun) a man with a chauvinistic belief in the inferiority of women | Synonyms: male chauvinist |
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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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| socialist | (noun) a political advocate of socialism | - |
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| 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 | (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, sensitive |
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| 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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| stockist | (noun) one (as a retailer or distributor) that stocks goods | - |
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| strategist | (noun) an expert in strategy (especially in warfare) | Synonyms: strategian |
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| stylist | (noun) an artist who is a master of a particular style | - |
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| (noun) someone who cuts or beautifies hair | Synonyms: hairdresser, hairstylist, styler |
| subjectivist | (noun) a person who subscribes to subjectivism | - |
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| suffragist | (noun) an advocate of the extension of voting rights (especially to women) | - |
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| supremacist | (noun) a person who advocates the supremacy of some particular group or racial group over all others | - |
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| suprematist | (noun) an artist of the school of suprematism | - |
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| surrealist | (noun) an artist who is a member of the movement called surrealism | - |
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| survivalist | (noun) someone who tries to insure their personal survival or the survival of their group or nation | - |
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| syllogist | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogiser, syllogizer |
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| symbolist | (noun) a member of an artistic movement that expressed ideas indirectly via symbols | - |
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| (noun) someone skilled in the interpretation or representation of symbols | Synonyms: symboliser, symbolizer |
| symphonist | (noun) a composer of symphonies | - |
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| syndicalist | (noun) an advocate of anarchism | Synonyms: anarchist, nihilist |
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| synergist | (noun) a drug that augments the activity of another drug | - |
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| synonymist | (noun) a student of synonyms | - |
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| synthesist | (noun) an intellectual who synthesizes or uses synthetic methods | Synonyms: synthesiser, synthesizer |
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| systematist | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: taxonomer, taxonomist |
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| (noun) an organizer who puts things in order | Synonyms: orderer, systematiser, systematizer, systemiser, systemizer |
| taxidermist | (noun) a craftsman who stuffs and mounts the skins of animals for display | Synonyms: animal stuffer, stuffer |
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| taxonomist | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomer |
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| technologist | (noun) a person who uses scientific knowledge to solve practical problems | Synonyms: applied scientist, engineer |
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| teetotalist | (noun) a total abstainer | Synonyms: teetotaler, teetotaller |
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| telegraphist | (noun) someone who transmits messages by telegraph | Synonyms: telegraph operator, telegrapher |
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| teleologist | (noun) advocate of teleology | - |
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| telepathist | (noun) someone with the power of communicating thoughts directly | Synonyms: mental telepathist, mind reader, thought-reader |
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| (noun) a magician who seems to discern the thoughts of another person (usually by clever signals from an accomplice) | Synonyms: mind reader, thought-reader |
| telephonist | (noun) someone who helps callers get the person they are calling | Synonyms: switchboard operator, telephone operator |
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| televangelist | (noun) an evangelist who conducts services on television | - |
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