| sundog | (noun) a bright spot on the parhelic circle; caused by diffraction by ice crystals | Synonyms: mock sun, parhelion |
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| sundown | (noun) the time in the evening at which the sun begins to fall below the horizon | Synonyms: sunset |
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| sundowner | (noun) a drink taken at sundown | - |
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| (noun) a tramp who habitually arrives at sundown | - |
| sundress | (noun) a light loose sleeveless summer dress with a wide neckline and thin shoulder straps that expose the arms and shoulders | - |
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| sundries | (noun) miscellaneous objects too numerous or too small to be specified | - |
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| sundrops | (noun) a day-flowering biennial or perennial of the genus Oenothera | Synonyms: Oenothera fruticosa |
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| sunfish | (noun) small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies, black bass, bluegills, pumpkinseed | Synonyms: centrarchid |
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| (noun) among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters | Synonyms: headfish, mola, ocean sunfish |
| (noun) the lean flesh of any of numerous American perch-like fishes of the family Centrarchidae | - |
| sunflower | (noun) any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | Synonyms: helianthus |
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| sunglass | (noun) a convex lens that focuses the rays of the sun; used to start a fire | - |
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| sunglasses | (noun) (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun | Synonyms: dark glasses, shades |
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| sunhat | (noun) a hat with a broad brim that protects the face from direct exposure to the sun | Synonyms: sun hat |
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| sunlamp | (noun) a mercury-vapor lamp used in medical or cosmetic treatments | Synonyms: sun-ray lamp, sun lamp, sunray lamp |
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| sunlight | (noun) the rays of the sun | Synonyms: sun, sunshine |
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| sunniness | (noun) lightness created by sunlight | - |
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| (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunshine |
| sunporch | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: solarium, sun lounge, sun parlor, sun parlour, sun porch, sunroom |
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| sunray | (noun) a ray of sunlight | Synonyms: sunbeam |
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| (noun) a ray of artificial ultraviolet light from a sunray lamp | Synonyms: sun-ray |
| (noun) herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona | Synonyms: Enceliopsis nudicaulis |
| sunrise | (noun) the daily event of the sun rising above the horizon | - |
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| (noun) atmospheric phenomena accompanying the daily appearance of the sun | - |
| (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunup |
| sunroof | (noun) an automobile roof having a sliding or raisable panel | Synonyms: sunshine-roof |
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| sunroom | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: solarium, sun lounge, sun parlor, sun parlour, sun porch, sunporch |
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| sunrose | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: helianthemum, sun rose |
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| sunscreen | (noun) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn | Synonyms: sun blocker, sunblock |
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| sunset | (noun) the daily event of the sun sinking below the horizon | - |
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| (noun) atmospheric phenomena accompanying the daily disappearance of the sun | - |
| (noun) the time in the evening at which the sun begins to fall below the horizon | Synonyms: sundown |
| sunshade | (noun) a canopy made of canvas to shelter people or things from rain or sun | Synonyms: awning, sunblind |
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| (noun) a handheld collapsible source of shade | Synonyms: parasol |
| sunshine | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunniness |
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| (noun) the rays of the sun | Synonyms: sun, sunlight |
| (noun) moderate weather; suitable for outdoor activities | Synonyms: fair weather, temperateness |
| sunspot | (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: macula |
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| sunstone | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: aventurine |
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| sunstroke | (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: insolation, siriasis, thermic fever |
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| sunsuit | (noun) a child's garment consisting of a brief top and shorts | - |
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| suntan | (noun) a browning of the skin resulting from exposure to the rays of the sun | Synonyms: tan |
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| suntrap | (noun) a terrace or garden oriented to take advantage of the sun while protected from cold winds | Synonyms: solar trap |
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| sunup | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise |
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| sup | (noun) a small amount of liquid food | Synonyms: swallow |
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| super | (noun) a caretaker for an apartment house; represents the owner as janitor and rent collector | Synonyms: superintendent |
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| superabundance | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuch, overmuchness |
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| superannuation | (noun) the act of discharging someone because of age (especially to cause someone to retire from service on a pension) | - |
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| (noun) the property of being out of date and not current | Synonyms: obsoleteness |
| (noun) a monthly payment made to someone who is retired from work | Synonyms: old-age pension, retirement benefit, retirement check, retirement fund, retirement pension |
| superbia | (noun) unreasonable and inordinate self-esteem (personified as one of the deadly sins) | Synonyms: pride |
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| superbug | (noun) a strain of bacteria that is resistant to all antibiotics | - |
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| (noun) a strain of pest accidentally imported into Florida from the Middle East then spread to California where it is a very serious pest feeding on almost all vegetable crops and poinsettias | Synonyms: Bemisia tabaci, poinsettia strain |
| supercargo | (noun) an officer on a merchant ship in charge of the cargo and its sale and purchase | - |
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| supercharger | (noun) compressor that forces increased oxygen into the cylinders of an internal-combustion engine | - |
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| superciliousness | (noun) the trait of displaying arrogance by patronizing those considered inferior | Synonyms: condescension, disdainfulness |
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| supercilium | (noun) the arch of hair above each eye | Synonyms: brow, eyebrow |
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| superclass | (noun) (biology) a taxonomic class below a phylum and above a class | - |
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| supercomputer | (noun) a mainframe computer that is one of the most powerful available at a given time | - |
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| superconductivity | (noun) the disappearance of electrical resistance at very low temperatures | - |
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| superdad | (noun) an informal term for a father who can combine childcare and full-time employment | - |
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| superego | (noun) (psychoanalysis) that part of the unconscious mind that acts as a conscience | - |
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| supererogation | (noun) an effort above and beyond the call of duty | - |
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| superfamily | (noun) (biology) a taxonomic group ranking below an order but above a family | - |
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| superfecta | (noun) a bet that you can pick the first four finishers in a race in the right order | - |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| superfetation | (noun) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time | - |
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| superficiality | (noun) lack of depth of knowledge or thought or feeling | Synonyms: shallowness |
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| (noun) shallowness in terms of affecting only surface layers of something | - |
| superficies | (noun) outer surface of an area or a body | - |
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| (noun) the purely external aspect of a thing; superficial appearance | - |
| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| superfood | (noun) a food with health benefits | - |
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| supergiant | (noun) an extremely bright star of very large diameter and low density | - |
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| supergrass | (noun) a police informer who implicates many people | Synonyms: grass |
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| superhet | (noun) a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified | Synonyms: heterodyne receiver, superheterodyne receiver |
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| superhighway | (noun) a broad highway designed for high-speed traffic | Synonyms: expressway, freeway, motorway, pike, state highway, throughway, thruway |
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| (noun) an extensive electronic network (such as the internet) used for the rapid transfer of sound and video and graphics in digital form | Synonyms: information superhighway |
| superhumanity | (noun) The state or condition of being beyond what is possible for a human being. | - |
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| superinfection | (noun) infection that occurs while you are being treated for another infection | - |
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| superintelligence | (noun) Remarkable intelligence, intelligence at or above and beyond the level of a genius. | Synonyms: hyperintelligence |
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| superintendence | (noun) management by overseeing the performance or operation of a person or group | Synonyms: oversight, supervising, supervision |
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| superintendent | (noun) a person who directs and manages an organization | Synonyms: overseer |
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| (noun) a caretaker for an apartment house; represents the owner as janitor and rent collector | Synonyms: super |
| superior | (noun) a character or symbol set or printed or written above and immediately to one side of another character | Synonyms: superscript |
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| (noun) one of greater rank or station or quality | Synonyms: higher-up, superordinate |
| (noun) the head of a religious community | - |
| (noun) a combatant who is able to defeat rivals | Synonyms: master, victor |
| superiority | (noun) the quality of being superior | Synonyms: high quality |
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| (noun) the quality of being at a competitive advantage | Synonyms: favorable position, favourable position |
| (noun) displaying a sense of being better than others | - |
| (noun) the state of excelling or surpassing or going beyond usual limits | Synonyms: transcendence, transcendency |
| superlative | (noun) an exaggerated expression (usually of praise) | - |
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| (noun) the superlative form of an adjective or adverb | Synonyms: superlative degree |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, pinnacle, summit, tiptop, top |
| superload | (noun) a variable load on a structure (e.g. a bridge) such as moving traffic | Synonyms: live load |
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| superman | (noun) street name for lysergic acid diethylamide | Synonyms: acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, window pane, Zen |
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| (noun) a person with great powers and abilities | Synonyms: demigod, Ubermensch |
| supermarket | (noun) a large self-service grocery store selling groceries and dairy products and household goods | - |
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| supermarketeer | (noun) an operator of a supermarket | Synonyms: supermarketer |
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| supermarketer | (noun) an operator of a supermarket | Synonyms: supermarketeer |
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| supermodel | (noun) a fashion model who has attained the status of a celebrity | - |
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| supermolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: macromolecule |
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| supermom | (noun) an informal term for a mother who can combine childcare and full-time employment | - |
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| supernatant | (noun) the clear liquid that lies above a sediment or precipitate | - |
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| supernatural | (noun) supernatural forces and events and beings collectively | Synonyms: occult |
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| supernaturalism | (noun) the quality of being attributed to power that seems to violate or go beyond natural forces | Synonyms: supernaturalness |
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| (noun) a belief in forces beyond ordinary human understanding | - |
| supernaturalness | (noun) the quality of being attributed to power that seems to violate or go beyond natural forces | Synonyms: supernaturalism |
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| supernova | (noun) a star that explodes and becomes extremely luminous in the process | - |
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| supernumerary | (noun) a minor actor in crowd scenes | Synonyms: extra, spear carrier |
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| (noun) a person serving no apparent function | - |
| superorder | (noun) (biology) a taxonomic group ranking above an order and below a class or subclass | - |
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| superordinate | (noun) a word that is more generic than a given word | Synonyms: hypernym, superordinate word |
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| (noun) one of greater rank or station or quality | Synonyms: higher-up, superior |
| superordination | (noun) the semantic relation of being superordinate or belonging to a higher rank or class | Synonyms: hypernymy |
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| superoxide | (noun) the univalent anion O2- | Synonyms: superoxide anion |
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| (noun) a metallic oxide containing the univalent anion O2- | - |
| superpatriotism | (noun) fanatical patriotism | Synonyms: chauvinism, jingoism, ultranationalism |
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| superphylum | (noun) (biology) a taxonomic group ranking between a phylum and below a class or subclass | - |
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| superposition | (noun) the placement of one thing on top of another | - |
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| (noun) (geometry) the placement of one object ideally in the position of another one in order to show that the two coincide | - |
| (noun) (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest | Synonyms: principle of superposition, superposition principle |
| (noun) (geology) the deposition of one geological stratum on another | - |
| superpower | (noun) a state powerful enough to influence events throughout the world | Synonyms: great power, major power, power, world power |
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| superscript | (noun) a character or symbol set or printed or written above and immediately to one side of another character | Synonyms: superior |
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| superscription | (noun) the activity of superscribing | - |
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| (noun) an inscription written above something else | - |
| supersedure | (noun) act of replacing one person or thing by another especially one held to be superior | Synonyms: supersession |
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| supersession | (noun) act of replacing one person or thing by another especially one held to be superior | Synonyms: supersedure |
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| superslasher | (noun) large (20-ft) and swift carnivorous dinosaur having an upright slashing claw 15 inches long on each hind foot; early Cretaceous | Synonyms: utahraptor |
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| superstar | (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, adept, champion, genius, hotshot, maven, mavin, sensation, star, virtuoso, whiz, whizz, wiz, wizard |
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| superstition | (noun) an irrational belief arising from ignorance or fear | Synonyms: superstitious notion |
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| superstrate | (noun) the language of a later invading people that is imposed on an indigenous population and contributes features to their language | Synonyms: superstratum |
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| (noun) any stratum or layer superimposed on another | Synonyms: superstratum |
| superstratum | (noun) the language of a later invading people that is imposed on an indigenous population and contributes features to their language | Synonyms: superstrate |
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| (noun) any stratum or layer superimposed on another | Synonyms: superstrate |
| superstring | (noun) a hypothetical particle that is the elementary particle in a theory of space-time | - |
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| superstructure | (noun) structure consisting of the part of a ship above the main deck | - |
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