| abstain | (verb) choose not to consume | Synonyms: desist, refrain |
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| (verb) refrain from voting | - |
| 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 |
| backstair | (adjective) secret and sly or sordid | Synonyms: backstairs, furtive |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| (noun) a second staircase at the rear of a building | - |
| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstained | (adjective) covered with blood | Synonyms: gory |
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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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| destain | (verb) remove stain from (a laboratory specimen) to enhance contrast | - |
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| downstair | (adjective) on or of lower floors of a building | Synonyms: downstairs |
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| downstairs | (adjective) on or of lower floors of a building | Synonyms: downstair |
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| (adverb) on a floor below | Synonyms: below, down the stairs, on a lower floor |
| staid | (adjective) characterized by dignity and propriety | Synonyms: sedate |
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| staidly | (adverb) in a grave and sober manner | Synonyms: gravely, soberly |
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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 | - |
| (verb) produce or leave stains | - |
| (verb) color with a liquid dye or tint | - |
| (verb) color for microscopic study | Synonyms: dye |
| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, maculate, sully, tarnish |
| stainability | (noun) (cytology) the capacity of cells or cell parts to stain specifically with certain dyes | - |
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| stainable | (adjective) capable of being stained (especially of cells and cell parts) | - |
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| stained | (adjective) marked or dyed or discolored with foreign matter | - |
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| (adjective) having a coating of stain or varnish | Synonyms: varnished |
| 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 | (adjective) (of reputation) free from blemishes | Synonyms: unstained, unsullied, untainted, untarnished |
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| (noun) steel containing chromium that makes it resistant to corrosion | Synonyms: chromium steel, stainless steel |
| 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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| sustain | (verb) undergo (as of injuries and illnesses) | Synonyms: get, have, suffer |
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| (verb) establish or strengthen as with new evidence or facts | Synonyms: affirm, confirm, corroborate, substantiate, support |
| (verb) admit as valid | - |
| (verb) supply with necessities and support | Synonyms: keep, maintain |
| (verb) provide with nourishment | Synonyms: nourish, nurture |
| (verb) be the physical support of; carry the weight of | Synonyms: hold, hold up, support |
| (verb) lengthen or extend in duration or space | Synonyms: keep up, prolong |
| sustainability | (noun) the property of being sustainable | - |
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| sustainable | (adjective) capable of being sustained | - |
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| sustained | (adjective) maintained at length without interruption or weakening | - |
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| (adjective) (of an electric arc) continuous | Synonyms: free burning |
| 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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| unstained | (adjective) not stained | - |
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| (adjective) without soil or spot or stain | Synonyms: unsoiled, unspotted |
| (adjective) (of reputation) free from blemishes | Synonyms: stainless, unsullied, untainted, untarnished |
| (adjective) not having a coating of stain or varnish | Synonyms: unvarnished |
| upstair | (adjective) on or of upper floors of a building | Synonyms: upstairs |
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| upstairs | (adjective) on or of upper floors of a building | Synonyms: upstair |
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| (noun) the part of a building above the ground floor | - |
| (adverb) on a floor above | Synonyms: on a higher floor, up the stairs |
| (adverb) with respect to the mind | - |