| abstainer | (noun) a person who refrains from drinking intoxicating beverages | Synonyms: abstinent, nondrinker |
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| (noun) someone who practices self denial as a spiritual discipline | Synonyms: ascetic |
| backstairs | (noun) a second staircase at the rear of a building | - |
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| bloodstain | (noun) a discoloration caused by blood | - |
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| counterstain | (noun) a stain of contrasting color that is used when the principal stain does not show the structure clearly | - |
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| staidness | (noun) a trait of dignified seriousness | Synonyms: sedateness, solemness, solemnity |
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| stain | (noun) an act that brings discredit to the person who does it | Synonyms: blot, smear, smirch, spot |
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| (noun) a soiled or discolored appearance | Synonyms: discoloration, discolouration |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stigma |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, soil |
| (noun) (microscopy) a dye or other coloring material that is used in microscopy to make structures visible | - |
| stainability | (noun) (cytology) the capacity of cells or cell parts to stain specifically with certain dyes | - |
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| stainer | (noun) a worker who stains (wood or fabric) | - |
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| staining | (noun) (histology) the use of a dye to color specimens for microscopic study | - |
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| (noun) the act of spotting or staining something | Synonyms: maculation, spotting |
| stainless | (noun) steel containing chromium that makes it resistant to corrosion | Synonyms: chromium steel, stainless steel |
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| stair | (noun) support consisting of a place to rest the foot while ascending or descending a stairway | Synonyms: step |
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| staircase | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: stairway |
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| stairhead | (noun) platform at the top of a staircase | - |
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| stairs | (noun) a flight of stairs or a flight of steps | Synonyms: steps |
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| stairway | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: staircase |
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| stairwell | (noun) a vertical well around which there is a stairway | - |
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| sustainability | (noun) the property of being sustainable | - |
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| sustainer | (noun) someone who upholds or maintains | Synonyms: maintainer, upholder |
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| sustainment | (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: maintenance, sustenance, sustentation, upkeep |
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| upstairs | (noun) the part of a building above the ground floor | - |
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