| sealant | (noun) a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface) | Synonyms: sealer |
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| seaplane | (noun) an airplane that can land on or take off from water | Synonyms: hydroplane |
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| semblance | (noun) picture consisting of a graphic image of a person or thing | Synonyms: likeness |
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| (noun) an outward or token appearance or form that is deliberately misleading | Synonyms: color, colour, gloss |
| (noun) an erroneous mental representation | Synonyms: illusion |
| sibilant | (noun) a consonant characterized by a hissing sound (like s or sh) | Synonyms: sibilant consonant |
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| slander | (noun) an abusive attack on a person's character or good name | Synonyms: aspersion, calumny, defamation, denigration |
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| (noun) words falsely spoken that damage the reputation of another | - |
| slanderer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, maligner, traducer, vilifier |
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| slanderousness | (noun) The property of being both untrue and harmful to a reputation. | - |
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| slang | (noun) a characteristic language of a particular group (as among thieves) | Synonyms: argot, cant, jargon, lingo, patois, vernacular |
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| (noun) informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar | Synonyms: slang expression, slang term |
| slanginess | (noun) casualness in use of language | - |
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| slanguage | (noun) language characterized by excessive use of slang or cant | - |
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| slant | (noun) degree of deviation from a horizontal plane | Synonyms: pitch, rake |
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| (noun) a biased way of looking at or presenting something | Synonyms: angle |
| solan | (noun) very large white gannet with black wing tips | Synonyms: solan goose, solant goose, Sula bassana |
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| southland | (noun) any region lying in or toward the south | - |
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| stimulant | (noun) a drug that temporarily quickens some vital process | Synonyms: excitant, stimulant drug |
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| (noun) any stimulating information or event; acts to arouse action | Synonyms: input, stimulation, stimulus |
| supplanter | (noun) one who wrongfully or illegally seizes and holds the place of another | Synonyms: usurper |
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| supplanting | (noun) act of taking the place of another especially using underhanded tactics | Synonyms: displacement |
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| surveillance | (noun) close observation of a person or group (usually by the police) | - |
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| swampland | (noun) low land that is seasonally flooded; has more woody plants than a marsh and better drainage than a bog | Synonyms: swamp |
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| tableland | (noun) a relatively flat highland | Synonyms: plateau |
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| tailplane | (noun) the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged | Synonyms: horizontal stabiliser, horizontal stabilizer |
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| tideland | (noun) land near the sea that is overflowed by the tide | - |
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| timberland | (noun) land that is covered with trees and shrubs | Synonyms: forest, timber, woodland |
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| topgallant | (noun) a mast fixed to the head of a topmast on a square-rigged vessel | Synonyms: topgallant mast |
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| (noun) a sail set on a yard of a topgallant mast | Synonyms: topgallant sail |
| transplant | (noun) the act of removing something from one location and introducing it in another location | Synonyms: transplantation, transplanting |
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| (noun) an operation moving an organ from one organism (the donor) to another (the recipient) | Synonyms: organ transplant, transplantation |
| (noun) (surgery) tissue or organ transplanted from a donor to a recipient; in some cases the patient can be both donor and recipient | Synonyms: graft |
| transplantation | (noun) the act of removing something from one location and introducing it in another location | Synonyms: transplant, transplanting |
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| (noun) an operation moving an organ from one organism (the donor) to another (the recipient) | Synonyms: organ transplant, transplant |
| transplanter | (noun) a gardener who moves plants to new locations | - |
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| transplanting | (noun) the act of removing something from one location and introducing it in another location | Synonyms: transplant, transplantation |
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| unbalance | (noun) a lack of balance or state of disequilibrium | Synonyms: imbalance, instability |
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| (noun) a state of mental disturbance and disorientation | Synonyms: derangement, mental unsoundness |
| upland | (noun) elevated (e.g., mountainous) land | Synonyms: highland |
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| valance | (noun) a decorative framework to conceal curtain fixtures at the top of a window casing | Synonyms: cornice, pelmet, valance board |
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| vigilance | (noun) vigilant attentiveness | Synonyms: watchfulness, weather eye |
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| (noun) the process of paying close and continuous attention | Synonyms: alertness, wakefulness, watchfulness |
| vigilante | (noun) member of a vigilance committee | Synonyms: vigilance man |
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| vigilantism | (noun) the actions of a vigilance committee in trying to enforce the laws | - |
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| warplane | (noun) an aircraft designed and used for combat | Synonyms: military plane |
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| wasteland | (noun) an uninhabited wilderness that is worthless for cultivation | Synonyms: barren, waste |
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| wetland | (noun) a low area where the land is saturated with water | - |
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| wonderland | (noun) an imaginary realm of marvels or wonders | - |
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| (noun) a place or scene of great or strange beauty or wonder | - |
| woodland | (noun) land that is covered with trees and shrubs | Synonyms: forest, timber, timberland |
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| xenotransplant | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplantation |
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| xenotransplantation | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplant |
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| zooplankton | (noun) animal constituent of plankton; mainly small crustaceans and fish larvae | - |
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