| 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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| pterygium | (noun) either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula | - |
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| pudginess | (noun) the property of having a plump and round body | Synonyms: chubbiness, rolypoliness, tubbiness |
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| pugilism | (noun) fighting with the fists | Synonyms: boxing, fisticuffs |
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| pugilist | (noun) someone who fights with his fists for sport | Synonyms: boxer |
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| purging | (noun) an act of removing by cleansing; ridding of sediment or other undesired elements | Synonyms: purge |
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| (noun) the act of clearing yourself (or another) from some stigma or charge | Synonyms: purgation, purge |
| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quislingism | (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaboration, collaborationism |
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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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| ragi | (noun) East Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orient | Synonyms: African millet, coracan, corakan, Eleusine coracana, finger millet, kurakkan, ragee |
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| ranginess | (noun) The state of being slender and long of limb, lanky. | - |
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| ravaging | (noun) plundering with excessive damage and destruction | Synonyms: devastation |
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| reagin | (noun) an immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the local inflammation characteristic of an allergy | - |
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| regicide | (noun) the act of killing a king | - |
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| (noun) someone who commits regicide; the killer of a king | - |
| regime | (noun) (medicine) a systematic plan for therapy (often including diet) | Synonyms: regimen |
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| (noun) the organization that is the governing authority of a political unit | Synonyms: authorities, government |
| regimen | (noun) (medicine) a systematic plan for therapy (often including diet) | Synonyms: regime |
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| regiment | (noun) army unit smaller than a division, which can be divided into several companies, squadrons, or batteries and often into two battalions. | - |
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| regimentals | (noun) the military uniform and insignia of a regiment | - |
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| regimentation | (noun) the imposition of order or discipline | - |
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| region | (noun) a part of an animal that has a special function or is supplied by a given artery or nerve | Synonyms: area |
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| (noun) a knowledge domain that you are interested in or are communicating about | Synonyms: realm |
| (noun) the extended spatial location of something | Synonyms: part |
| (noun) a large indefinite location on the surface of the Earth | - |
| (noun) the approximate amount of something (usually used prepositionally as in `in the region of') | Synonyms: neighborhood |
| regionalism | (noun) loyalty to the interests of a particular region | - |
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| (noun) a feature (as a pronunciation or expression or custom) that is characteristic of a particular region | - |
| (noun) a foreign policy that defines the international interests of a country in terms of particular geographic areas | - |
| regionality | (noun) The property of being of, or pertaining to, a specific region or district. | - |
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| (noun) The property of being of, or pertaining to, a large geographic region. | - |
| register | (noun) a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device | - |
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| (noun) an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room | - |
| (noun) a cashbox with an adding machine to register transactions; used in shops to add up the bill | Synonyms: cash register |
| (noun) (computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind | - |
| (noun) (music) the timbre that is characteristic of a certain range and manner of production of the human voice or of different pipe organ stops or of different musical instruments | - |
| (noun) an official written record of names or events or transactions | Synonyms: registry |
| (noun) a book in which names and transactions are listed | - |
| registrant | (noun) a person who is formally entered (along with others) in a register (and who obtains certain rights thereby) | - |
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| registrar | (noun) someone responsible for keeping records | Synonyms: record-keeper, recorder |
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| (noun) the administrator responsible for student records | - |
| (noun) a person employed to keep a record of the owners of stocks and bonds issued by the company | - |
| registration | (noun) the act of enrolling | Synonyms: enrollment, enrolment |
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| (noun) the act of adjusting something to match a standard | Synonyms: adjustment, readjustment |
| (noun) (music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops | - |
| (noun) a document certifying an act of registering | - |
| (noun) the body of people (such as students) who register or enroll at the same time | Synonyms: enrollment |
| registry | (noun) an official written record of names or events or transactions | Synonyms: register |
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| regurgitation | (noun) the reflex act of ejecting the contents of the stomach through the mouth | Synonyms: disgorgement, emesis, puking, vomit, vomiting |
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| (noun) recall after rote memorization | - |
| (noun) backflow of blood through a defective heart valve | - |
| religion | (noun) a strong belief in a supernatural power or powers that control human destiny | Synonyms: faith, religious belief |
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| (noun) an institution to express belief in a divine power | Synonyms: faith, organized religion |
| religionism | (noun) exaggerated or affected piety and religious zeal | Synonyms: pietism, religiosity, religiousism |
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| (noun) exaggerated religious zealotry | - |
| religionist | (noun) a person addicted to religion or a religious zealot | - |
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| religiosity | (noun) exaggerated or affected piety and religious zeal | Synonyms: pietism, religionism, religiousism |
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| religious | (noun) a member of a religious order who is bound by vows of poverty and chastity and obedience | - |
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| religiousism | (noun) exaggerated or affected piety and religious zeal | Synonyms: pietism, religionism, religiosity |
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| religiousness | (noun) piety by virtue of being devout | Synonyms: devoutness |
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| (noun) the quality of being extremely conscientious | - |
| 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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| ridgil | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgeling, ridgling |
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| rigging | (noun) gear consisting of ropes etc. supporting a ship's masts and sails | Synonyms: tackle |
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| (noun) formation of masts, spars, sails, etc., on a vessel | Synonyms: rig |
| rigidification | (noun) the process of becoming stiff or rigid | Synonyms: rigidifying, stiffening |
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| rigidifying | (noun) the process of becoming stiff or rigid | Synonyms: rigidification, stiffening |
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| rigidity | (noun) the physical property of being stiff and resisting bending | Synonyms: rigidness |
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| (noun) the quality of being rigid and rigorously severe | Synonyms: inflexibility, rigidness |
| rigidness | (noun) the physical property of being stiff and resisting bending | Synonyms: rigidity |
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| (noun) the quality of being rigid and rigorously severe | Synonyms: inflexibility, rigidity |
| ringgit | (noun) the basic unit of money in Malaysia; equal to 100 sen | - |
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| ringing | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: plangency, resonance, reverberance, sonority, sonorousness, vibrancy |
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| (noun) the giving of a ring as a token of engagement | - |
| (noun) the sound of a bell ringing | Synonyms: ring, tintinnabulation |
| sacrilegiousness | (noun) profaneness by virtue of committing sacrilege | - |
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| sagitta | (noun) any arrowworm of the genus Sagitta | - |
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| salesgirl | (noun) a woman salesperson | Synonyms: saleslady, saleswoman |
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| salpingitis | (noun) inflammation of a Fallopian tube (usually the result of infection spreading from the vagina or uterus) or of a Eustachian tube | - |
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| schoolgirl | (noun) a girl attending school | - |
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| seaborgium | (noun) a transuranic element with atomic number 106 | Synonyms: atomic number 106, element 106, Sg |
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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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| shagginess | (noun) roughness of nap produced by long woolly hairs | - |
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| (noun) unkemptness of hair | - |
| shogi | (noun) a form of chess played on a board of 81 squares; each player has 20 pieces | - |
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| showgirl | (noun) a woman who dances in a chorus line | Synonyms: chorine, chorus girl |
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| singing | (noun) the act of singing vocal music | Synonyms: vocalizing |
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| (noun) disclosing information or giving evidence about another | Synonyms: tattle, telling |
| slanginess | (noun) casualness in use of language | - |
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| slinging | (noun) throwing with a wide motion (as if with a sling) | - |
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| sluggishness | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, lethargy, phlegm |
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| (noun) the pace of things that move relatively slowly | - |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, lethargy |
| smidgin | (noun) a tiny or scarcely detectable amount | Synonyms: iota, scintilla, shred, smidge, smidgen, smidgeon, tittle, whit |
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| smogginess | (noun) air pollution by a mixture of smoke and fog | Synonyms: smog |
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| snogging | (noun) (British informal) cuddle and kiss | - |
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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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| sogginess | (noun) a heavy wetness | - |
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| solfeggio | (noun) a voice exercise; singing scales or runs to the same syllable | Synonyms: solfege |
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| (noun) singing using solfa syllables to denote the notes of the scale of C major | Synonyms: solfege, solmization |
| 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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| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| spongillafly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongefly |
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| sponginess | (noun) the porosity of a sponge | - |
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| (noun) the property of being able to occupy less space | Synonyms: compressibility, squeezability |
| spongioblast | (noun) any of various columnar epithelial cells in the central nervous system that develop into neuroglia | - |
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| spongioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: glioblastoma |
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| sporangiophore | (noun) stalk bearing one or more sporangia | - |
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| sporangium | (noun) organ containing or producing spores | Synonyms: spore case, spore sac |
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| springiness | (noun) the elasticity of something that can be stretched and returns to its original length | Synonyms: give, spring |
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| staginess | (noun) an artificial and mannered quality | Synonyms: theatricality |
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| staging | (noun) travel by stagecoach | - |
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| (noun) getting rid of a stage of a multistage rocket | - |
| (noun) a system of scaffolds | Synonyms: scaffolding |
| (noun) the production of a drama on the stage | Synonyms: theatrical production |
| steatopygia | (noun) an extreme accumulation of fat on the buttocks | - |
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| stenopterygius | (noun) an ichthyosaur of the genus Stenopterygius | Synonyms: Stenopterygius quadrisicissus |
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| stinginess | (noun) a lack of generosity; a general unwillingness to part with money | - |
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| stinging | (noun) a kind of pain; something as sudden and painful as being stung | Synonyms: sting |
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| stodginess | (noun) dull and pompous gravity | Synonyms: stuffiness |
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| stogie | (noun) a cheap cigar | Synonyms: stogy |
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| strategian | (noun) an expert in strategy (especially in warfare) | Synonyms: strategist |
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| strategics | (noun) the science or art of strategy | - |
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| strategist | (noun) an expert in strategy (especially in warfare) | Synonyms: strategian |
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| submerging | (noun) sinking until covered completely with water | Synonyms: immersion, submergence, submersion |
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| suffragism | (noun) the belief that the right to vote should be extended (as to women) | - |
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| suffragist | (noun) an advocate of the extension of voting rights (especially to women) | - |
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| sugi | (noun) tall evergreen of Japan and China yielding valuable soft wood | Synonyms: Cryptomeria japonica, Japan cedar, Japanese cedar |
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| supergiant | (noun) an extremely bright star of very large diameter and low density | - |
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| swaggie | (noun) an itinerant Australian laborer who carries his personal belongings in a bundle as he travels around in search of work | Synonyms: swagger, swagman |
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| swinging | (noun) changing location by moving back and forth | Synonyms: swing, vacillation |
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| syllogiser | (noun) logician skilled in syllogistic reasoning | Synonyms: syllogist, syllogizer |
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