| octogenarian | (noun) someone whose age is in the eighties | - |
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| ophidian | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: serpent, snake |
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| optician | (noun) a worker who makes glasses for remedying defects of vision | Synonyms: lens maker |
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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| paediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, pediatrician, pediatrist |
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| parliamentarian | (noun) an expert in parliamentary rules and procedures | - |
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| patrician | (noun) a member of the aristocracy | Synonyms: aristocrat, blue blood |
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| (noun) a person of refined upbringing and manners | - |
| pedestrian | (noun) a person who travels by foot | Synonyms: footer, walker |
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| pediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrist |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| phonetician | (noun) a specialist in phonetics | - |
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| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| physician | (noun) a licensed medical practitioner | Synonyms: doc, doctor, Dr., MD, medico |
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| planarian | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planaria |
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| platitudinarian | (noun) a bore who makes excessive use of platitudes | - |
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| platyrrhinian | (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhine |
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| plebeian | (noun) one of the common people | Synonyms: pleb |
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| politician | (noun) a person active in party politics | Synonyms: pol, political leader, politico |
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| (noun) a leader engaged in civil administration | - |
| (noun) a schemer who tries to gain advantage in an organization in sly or underhanded ways | - |
| postdiluvian | (noun) anything living after Noah's flood | - |
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| practician | (noun) someone who practices a learned profession | Synonyms: practitioner |
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| predestinarian | (noun) anyone who submits to the belief that they are powerless to change their destiny | Synonyms: determinist, fatalist, predestinationist |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| proletarian | (noun) a member of the working class (not necessarily employed) | Synonyms: prole, worker |
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| prosimian | (noun) primitive primates having large ears and eyes and characterized by nocturnal habits | - |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| reptilian | (noun) any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms | Synonyms: reptile |
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| rhetorician | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, speechifier, speechmaker |
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| ruffian | (noun) a cruel and brutal fellow | Synonyms: bully, hooligan, roughneck, rowdy, tough, yob, yobbo, yobo |
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| salientian | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, batrachian, frog, toad, toad frog |
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| salutatorian | (noun) a graduating student with the second highest academic rank; may deliver the opening address at graduation exercises | Synonyms: salutatory speaker |
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| sarcocystieian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcosporidian |
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| sarcodinian | (noun) protozoa that move and capture food by forming pseudopods | Synonyms: sarcodine |
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| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| saurian | (noun) any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs | - |
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| saurischian | (noun) herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile | Synonyms: saurischian dinosaur |
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| sectarian | (noun) a member of a sect | Synonyms: sectarist, sectary |
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| selachian | (noun) any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks, rays, skates | Synonyms: elasmobranch |
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| seminarian | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarist |
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| semiotician | (noun) a specialist in the study of meaning | Synonyms: semanticist |
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| septuagenarian | (noun) someone whose age is in the seventies | - |
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| sertularian | (noun) feathery colony of long-branched stems bearing stalkless paired polyps | - |
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| sesquipedalian | (noun) a very long word (a foot and a half long) | Synonyms: sesquipedalia |
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| sexagenarian | (noun) someone whose age is in the sixties | - |
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| simian | (noun) an ape or monkey | - |
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| sirenian | (noun) any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs | Synonyms: sea cow, sirenian mammal |
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| solitudinarian | (noun) one who lives in solitude | Synonyms: hermit, recluse, solitary, troglodyte |
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| statistician | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: actuary |
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| (noun) a mathematician who specializes in statistics | Synonyms: mathematical statistician |
| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| strategian | (noun) an expert in strategy (especially in warfare) | Synonyms: strategist |
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| syntactician | (noun) a linguist who specializes in the study of grammar and syntax | Synonyms: grammarian |
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| tactician | (noun) a person who is skilled at planning tactics | - |
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| technician | (noun) someone whose occupation involves training in a specific technical process | - |
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| (noun) someone known for high skill in some intellectual or artistic technique | - |
| tellurian | (noun) an inhabitant of the earth | Synonyms: earthling, earthman, worldling |
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| theologian | (noun) someone who is learned in theology or who speculates about theology | Synonyms: theologiser, theologist, theologizer |
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| theoretician | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoriser, theorist, theorizer |
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| thespian | (noun) a theatrical performer | Synonyms: actor, histrion, player, role player |
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| titanosaurian | (noun) amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere | Synonyms: titanosaur |
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| totalitarian | (noun) an adherent of totalitarian principles or totalitarian government | - |
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| tragedian | (noun) an actor who specializes in tragic roles | - |
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| (noun) a writer (especially a playwright) who writes tragedies | - |
| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| utilitarian | (noun) someone who believes that the value of a thing depends on its utility | - |
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| valedictorian | (noun) the student with the best grades who usually delivers the valedictory address at commencement | Synonyms: valedictory speaker |
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| valerian | (noun) a plant of the genus Valeriana having lobed or dissected leaves and cymose white or pink flowers | - |
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| valetudinarian | (noun) weak or sickly person especially one morbidly concerned with his or her health | - |
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| vaudevillian | (noun) a performer who works in vaudeville | - |
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| vegetarian | (noun) eater of fruits and grains and nuts; someone who eats no meat or fish or (often) any animal products | - |
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| vesuvian | (noun) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone | Synonyms: idocrase, vesuvianite |
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| veterinarian | (noun) a doctor who practices veterinary medicine | Synonyms: vet, veterinary, veterinary surgeon |
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| vulgarian | (noun) a vulgar person (especially someone who makes a vulgar display of wealth) | - |
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