| phonologist | (noun) a specialist in phonology | - |
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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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| physiologist | (noun) a biologist specializing in physiology | - |
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| phytologist | (noun) a biologist specializing in the study of plants | Synonyms: botanist, plant scientist |
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| pomologist | (noun) someone versed in pomology or someone who cultivates fruit trees | - |
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| proctologist | (noun) a doctor specializing in diseases of the rectum and anus | - |
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| protozoologist | (noun) a zoologist who studies protozoans | - |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psychologist | (noun) a scientist trained in psychology | - |
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| pteridologist | (noun) an expert in the study of ferns | - |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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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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| 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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| seismologist | (noun) a geophysicist who studies earthquakes and the mechanical characteristics of the Earth | - |
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| serologist | (noun) a medical scientist who specializes in serology | - |
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| sociobiologist | (noun) a biologist who studies the biological determinants of social behavior | - |
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| sociologist | (noun) a social scientist who studies the institutions and development of human society | - |
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| 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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| strategist | (noun) an expert in strategy (especially in warfare) | Synonyms: strategian |
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| suffragist | (noun) an advocate of the extension of voting rights (especially to women) | - |
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| syllogist | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogiser, syllogizer |
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| synergist | (noun) a drug that augments the activity of another drug | - |
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| technologist | (noun) a person who uses scientific knowledge to solve practical problems | Synonyms: applied scientist, engineer |
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| teleologist | (noun) advocate of teleology | - |
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| thaumaturgist | (noun) one who practices magic or sorcery | Synonyms: magician, necromancer, sorcerer, thaumaturge, wizard |
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| theologist | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologian, theologiser, theologizer |
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| toxicologist | (noun) one who studies the nature and effects of poisons and their treatment | - |
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| tribologist | (noun) a specialist in tribology | - |
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| uranologist | (noun) a physicist who studies astronomy | Synonyms: astronomer, stargazer |
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| urologist | (noun) a specialist in urology | - |
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| virologist | (noun) a specialist in virology | - |
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| zoologist | (noun) a specialist in the branch of biology dealing with animals | Synonyms: animal scientist |
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