| speakeasy | (noun) (during prohibition) an illegal barroom | - |
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| speaker | (noun) electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance | Synonyms: loudspeaker, loudspeaker system, speaker system, speaker unit |
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| (noun) someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous) | Synonyms: talker, utterer, verbaliser, verbalizer |
| speakerphone | (noun) a telephone with a microphone and loudspeaker; can be used without picking up a handset; several people can participate in a call at the same time | - |
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| speakership | (noun) the position of Speaker | - |
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| speaking | (noun) delivering an address to a public audience | Synonyms: oral presentation, public speaking, speechmaking |
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| (noun) the utterance of intelligible speech | Synonyms: speech production |
| spear | (noun) a long pointed rod used as a tool or weapon | Synonyms: lance, shaft |
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| (noun) an implement with a shaft and barbed point used for catching fish | Synonyms: fishgig, fizgig, gig, lance |
| spearfish | (noun) any of several large vigorous pelagic fishes resembling sailfishes but with first dorsal fin much reduced; worldwide but rare | - |
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| spearhead | (noun) the head and sharpened point of a spear | Synonyms: spear-point, spearpoint |
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| (noun) the leading military unit in an attack | - |
| (noun) someone who leads or initiates an activity (attack or campaign etc.) | - |
| spearmint | (noun) common garden herb having clusters of small purplish flowers and yielding an oil used as a flavoring | Synonyms: Mentha spicata |
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| spearpoint | (noun) the head and sharpened point of a spear | Synonyms: spear-point, spearhead |
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| spec | (noun) a detailed description of design criteria for a piece of work | Synonyms: specification |
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| special | (noun) a special offering (usually temporary and at a reduced price) that is featured in advertising | - |
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| (noun) a television production that features a particular person or work or topic | - |
| (noun) a dish or meal given prominence in e.g. a restaurant | - |
| specialisation | (noun) the special line of work you have adopted as your career | Synonyms: specialism, speciality, specialization, specialty |
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| (noun) the act of specializing; making something suitable for a special purpose | Synonyms: specialization |
| (noun) (biology) the structural adaptation of some body part for a particular function | Synonyms: differentiation, specialization |
| specialiser | (noun) an expert who is devoted to one occupation or branch of learning | Synonyms: specialist, specializer |
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| specialism | (noun) the special line of work you have adopted as your career | Synonyms: specialisation, speciality, specialization, specialty |
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| (noun) the concentration of your efforts on a particular field of study or occupation | - |
| 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 |
| speciality | (noun) the special line of work you have adopted as your career | Synonyms: specialisation, specialism, specialization, specialty |
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| (noun) a distinguishing trait | Synonyms: distinctiveness, peculiarity, specialness, specialty |
| (noun) an asset of special worth or utility | Synonyms: forte, long suit, metier, specialty, strength, strong point, strong suit |
| specialization | (noun) the special line of work you have adopted as your career | Synonyms: specialisation, specialism, speciality, specialty |
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| (noun) the act of specializing; making something suitable for a special purpose | Synonyms: specialisation |
| (noun) (biology) the structural adaptation of some body part for a particular function | Synonyms: differentiation, specialisation |
| specializer | (noun) an expert who is devoted to one occupation or branch of learning | Synonyms: specialiser, specialist |
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| specialness | (noun) a distinguishing trait | Synonyms: distinctiveness, peculiarity, speciality, specialty |
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| (noun) the quality of being particular and pertaining to a specific case or instance | Synonyms: particularity |
| specialty | (noun) the special line of work you have adopted as your career | Synonyms: specialisation, specialism, speciality, specialization |
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| (noun) a distinguishing trait | Synonyms: distinctiveness, peculiarity, speciality, specialness |
| (noun) an asset of special worth or utility | Synonyms: forte, long suit, metier, speciality, strength, strong point, strong suit |
| speciation | (noun) the evolution of a biological species | - |
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| specie | (noun) coins collectively | Synonyms: coinage, metal money, mintage |
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| species | (noun) a specific kind of something | - |
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| (noun) (biology) taxonomic group whose members can interbreed | - |
| specific | (noun) a medicine that has a mitigating effect on a specific disease | - |
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| (noun) a fact about some part (as opposed to general) | Synonyms: particular |
| specification | (noun) a restriction that is insisted upon as a condition for an agreement | Synonyms: stipulation |
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| (noun) a detailed description of design criteria for a piece of work | Synonyms: spec |
| (noun) naming explicitly | - |
| (noun) (patent law) a document drawn up by the applicant for a patent of invention that provides an explicit and detailed description of the nature and use of an invention | - |
| specificity | (noun) the quality of being specific rather than general | - |
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| (noun) the quality of being specific to a particular organism | - |
| specifier | (noun) someone who draws up specifications giving details (as for obtaining a patent) | - |
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| specimen | (noun) a bit of tissue or blood or urine that is taken for diagnostic purposes | - |
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| (noun) an example regarded as typical of its class | - |
| speciousness | (noun) an appearance of truth that is false or deceptive; seeming plausibility | Synonyms: meretriciousness |
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| speck | (noun) a very small spot | Synonyms: pinpoint |
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| (noun) a slight but appreciable amount | Synonyms: hint, jot, mite, pinch, soupcon, tinge, touch |
| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, corpuscle, molecule, mote, particle |
| speckle | (noun) a small contrasting part of something | Synonyms: dapple, fleck, maculation, patch, spot |
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| specs | (noun) (plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision | Synonyms: eyeglasses, glasses, spectacles |
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| spectacle | (noun) a blunder that makes you look ridiculous; used in the phrase `make a spectacle of' yourself | - |
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| (noun) an elaborate and remarkable display on a lavish scale | - |
| (noun) something or someone seen (especially a notable or unusual sight) | - |
| spectacles | (noun) (plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision | Synonyms: eyeglasses, glasses, specs |
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| spectacular | (noun) a lavishly produced performance | - |
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| spectator | (noun) a woman's pump with medium heel; usually in contrasting colors for toe and heel | Synonyms: spectator pump |
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| (noun) a close observer; someone who looks at something (such as an exhibition of some kind) | Synonyms: looker, viewer, watcher, witness |
| specter | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, spectre, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, spectre |
| spectinomycin | (noun) an antibiotic used to treat gonorrhea | - |
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| spectrality | (noun) Quality of being spectral or ghostly. | - |
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| spectre | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, specter, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, specter |
| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| spectroscopy | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectrometry, spectroscopic analysis, spectrum analysis |
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| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| speculation | (noun) a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence) | Synonyms: conjecture |
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| (noun) continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature | Synonyms: meditation |
| (noun) a message expressing an opinion based on incomplete evidence | Synonyms: conjecture, guess, hypothesis, supposition, surmisal, surmise |
| (noun) an investment that is very risky but could yield great profits | Synonyms: venture |
| speculativeness | (noun) the quality of being a conclusion or opinion based on supposition and conjecture rather than on fact or investigation | - |
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| (noun) financial risk | - |
| speculator | (noun) someone who risks losses for the possibility of considerable gains | Synonyms: plunger |
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| (noun) someone who makes conjectures without knowing the facts | - |
| speculum | (noun) a medical instrument for dilating a bodily passage or cavity in order to examine the interior | - |
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| (noun) a mirror (especially one made of polished metal) for use in an optical instrument | - |
| speech | (noun) the mental faculty or power of vocal communication | Synonyms: language |
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| (noun) (language) communication by word of mouth | Synonyms: language, oral communication, speech communication, spoken communication, spoken language, voice communication |
| (noun) the act of delivering a formal spoken communication to an audience | Synonyms: address |
| (noun) words making up the dialogue of a play | Synonyms: actor's line, words |
| (noun) a lengthy rebuke | Synonyms: lecture, talking to |
| (noun) the exchange of spoken words | - |
| (noun) your characteristic style or manner of expressing yourself orally | Synonyms: delivery, manner of speaking |
| (noun) something spoken | - |
| speechifier | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, rhetorician, speechmaker |
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| speechlessness | (noun) the property of being speechless | - |
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| speechmaker | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, rhetorician, speechifier |
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| speechmaking | (noun) delivering an address to a public audience | Synonyms: oral presentation, public speaking, speaking |
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| speechwriter | (noun) a writer who composes speeches for others to deliver | - |
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| speed | (noun) changing location rapidly | Synonyms: hurrying, speeding |
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| (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: amphetamine, pep pill, upper |
| (noun) a rate (usually rapid) at which something happens | Synonyms: fastness, swiftness |
| (noun) the ratio of the focal length to the diameter of a (camera) lens system | Synonyms: f number, focal ratio, stop number |
| (noun) distance travelled per unit time | Synonyms: velocity |
| speedboat | (noun) a fast motorboat | - |
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| speeder | (noun) a driver who exceeds the safe speed limit | Synonyms: speed demon |
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| speediness | (noun) a rate that is rapid | Synonyms: celerity, quickness, rapidity, rapidness |
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| speeding | (noun) changing location rapidly | Synonyms: hurrying, speed |
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| speedometer | (noun) a meter fixed to a vehicle that measures and displays its speed | Synonyms: speed indicator |
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| speedpaint | (noun) Painting a picture in a very short amount of time | - |
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| speedskater | (noun) an ice-skater who races competitively; usually around an oval course | Synonyms: speed skater |
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| speedup | (noun) the act of accelerating; increasing the speed | Synonyms: acceleration, quickening |
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| speedway | (noun) a racetrack for racing automobiles or motorcycles | - |
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| (noun) road where high speed driving is allowed | - |
| speedwell | (noun) any plant of the genus Veronica | Synonyms: veronica |
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| spelaeologist | (noun) a person who explores caves | Synonyms: potholer, speleologist, spelunker |
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| spelaeology | (noun) the pastime of exploring caves | Synonyms: speleology |
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| (noun) the scientific study of caves | Synonyms: speleology |
| speleologist | (noun) a person who explores caves | Synonyms: potholer, spelaeologist, spelunker |
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| speleology | (noun) the pastime of exploring caves | Synonyms: spelaeology |
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| (noun) the scientific study of caves | Synonyms: spelaeology |
| spell | (noun) a verbal formula believed to have magical force | Synonyms: charm, magic spell, magical spell |
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| (noun) a psychological state induced by (or as if induced by) a magical incantation | Synonyms: enchantment, trance |
| (noun) a time period for working (after which you will be relieved by someone else) | Synonyms: go, tour, turn |
| (noun) a period of indeterminate length (usually short) marked by some action or condition | Synonyms: patch, piece, while |
| spellbinder | (noun) an orator who can hold his listeners spellbound | - |
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| spelldown | (noun) a contest in which you are eliminated if you fail to spell a word correctly | Synonyms: spelling bee, spelling contest |
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| speller | (noun) an introductory textbook to teach spelling | - |
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| (noun) someone who spells words | Synonyms: good speller, poor speller |
| spelling | (noun) forming words with letters according to the principles underlying accepted usage | - |
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| spelt | (noun) hardy wheat grown mostly in Europe for livestock feed | Synonyms: Triticum aestivum spelta, Triticum spelta |
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| spelter | (noun) impure zinc containing about three percent lead and other impurities (especially in the form of ingots) | - |
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| spelunker | (noun) a person who explores caves | Synonyms: potholer, spelaeologist, speleologist |
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| spender | (noun) someone who spends money to purchase goods or services | Synonyms: disburser, expender |
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| (noun) someone who spends money prodigally | Synonyms: scattergood, spend-all, spendthrift |
| spending | (noun) the act of spending or disbursing money | Synonyms: disbursal, disbursement, outlay |
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| (noun) money paid out; an amount spent | Synonyms: expenditure, outgo, outlay |
| spendthrift | (noun) someone who spends money prodigally | Synonyms: scattergood, spend-all, spender |
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| sperm | (noun) the male reproductive cell; the male gamete | Synonyms: sperm cell, spermatozoan, spermatozoon |
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| spermaceti | (noun) a white waxy substance from oil of the sperm whale | - |
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| spermatid | (noun) an immature gamete produced by a spermatocyte; develops into a spermatozoon | - |
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| spermatocele | (noun) a swelling on the epididymis or the testis; usually contains spermatozoa | - |
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| spermatocide | (noun) a contraceptive agent that kills spermatozoa | Synonyms: spermicide |
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| spermatocyte | (noun) a male gametocyte that develops into four spermatids | - |
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| spermatogenesis | (noun) development of spermatozoa | - |
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| spermatophyte | (noun) plant that reproduces by means of seeds not spores | Synonyms: phanerogam, seed plant |
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| spermatozoan | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoon |
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| spermatozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: antherozoid |
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| spermatozoon | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoan |
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| spermicide | (noun) a contraceptive agent that kills spermatozoa | Synonyms: spermatocide |
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| spermophile | (noun) any of various terrestrial burrowing rodents of Old and New Worlds; often destroy crops | Synonyms: gopher, ground squirrel |
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| spewer | (noun) a person who vomits | Synonyms: vomiter |
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