| sudatory | (noun) a bathhouse for hot air baths or steam baths | Synonyms: sudatorium |
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| (noun) a medicine that causes or increases sweating | Synonyms: sudorific |
| supererogatory | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, superfluous, supernumerary, surplus |
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| supinator | (noun) a muscle (especially in the forearm) that produces or assists in supination | - |
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| supplicatory | (adjective) humbly entreating | Synonyms: suppliant, supplicant |
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| syncopator | (noun) a musician who plays syncopated jazz music (usually in a dance band) | - |
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| syndicator | (noun) a businessman who forms a syndicate | - |
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| tabulator | (noun) a calculator that keeps a record of the number of times something happens | Synonyms: counter |
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| (noun) an electromechanical machine designed to assist in summarizing information and, later, accounting. | Synonyms: tabulating machine |
| tergiversator | (noun) a respondent who avoids giving a clear direct answer | Synonyms: equivocator, hedger |
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| terminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, exterminator |
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| testator | (noun) a person who makes a will | Synonyms: testate |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| titrator | (noun) an apparatus for performing a titration | - |
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| totalisator | (noun) computer that registers bets and divides the total amount bet among those who won | Synonyms: pari-mutuel machine, totaliser, totalizator, totalizer |
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| totalizator | (noun) computer that registers bets and divides the total amount bet among those who won | Synonyms: pari-mutuel machine, totalisator, totaliser, totalizer |
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| trafficator | (noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn | Synonyms: blinker, turn indicator, turn signal |
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| translator | (noun) a program that translates one programming language into another | Synonyms: translating program |
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| (noun) someone who mediates between speakers of different languages | Synonyms: interpreter |
| (noun) a person who translates written messages from one language to another | Synonyms: transcriber |
| turbogenerator | (noun) generator consisting of a steam turbine coupled to an electric generator for the production of electric power | - |
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| undulatory | (adjective) resembling waves in form or outline or motion | Synonyms: undulant |
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| unexploratory | (adjective) not exploratory | Synonyms: nonexplorative, nonexploratory, unexplorative |
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| urinator | (noun) a person who urinates | Synonyms: pisser |
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| vaccinator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: inoculator |
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| vacillator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, hesitator, waverer |
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| validatory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validating, verificatory, verifying |
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| valuator | (noun) one who estimates officially the worth or value or quality of things | Synonyms: appraiser |
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| vasodilator | (noun) a drug that causes dilation of blood vessels | Synonyms: vasodilative |
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| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
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| venerator | (noun) someone who regards with deep respect or reverence | - |
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| ventilator | (noun) a device (such as a fan) that introduces fresh air or expels foul air | - |
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| (noun) a device that facilitates breathing in cases of respiratory failure | Synonyms: breathing apparatus, breathing device, breathing machine |
| ventilatory | (adjective) provided with ventilation or involving pulmonary ventilation | - |
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| verificatory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verifying |
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| vesicatory | (adjective) causing blisters | Synonyms: vesicant |
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| (noun) a chemical agent that causes blistering (especially mustard gas) | Synonyms: vesicant |
| vibrator | (noun) mechanical device that produces vibratory motion; used for massage | - |
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| (noun) a mechanical device that vibrates | - |
| vibratory | (adjective) moving very rapidly to and fro or up and down | - |
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| vindicator | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, justifier |
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| vindicatory | (adjective) providing justification | Synonyms: justificative, justificatory |
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| (adjective) given or inflicted in requital according to merits or deserts | Synonyms: retributive, retributory |
| (adjective) of or relating to or having the nature of retribution | Synonyms: retaliative, retaliatory, retributive, retributory |
| violator | (noun) someone who assaults others sexually | Synonyms: debaucher, ravisher |
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| (noun) someone who violates the law | Synonyms: law offender, lawbreaker |
| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
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