| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| entreaty | (noun) earnest or urgent request | Synonyms: appeal, prayer |
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| hairstreak | (noun) small butterflies having striped markings under the wings | Synonyms: hairstreak butterfly |
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| headstream | (noun) a stream that forms the source of a river | - |
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| mainstream | (noun) the prevailing current of thought | - |
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| maltreater | (noun) someone who abuses | Synonyms: abuser |
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| maltreatment | (noun) cruel or inhumane treatment | Synonyms: abuse, ill-treatment, ill-usage |
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| midstream | (noun) the middle of a stream | - |
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| mistreatment | (noun) the practice of treating (someone or something) badly | - |
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| outreach | (noun) the act of reaching out | - |
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| retread | (noun) a used automobile tire that has been remolded to give it new treads | Synonyms: recap |
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| retreat | (noun) (military) withdrawal of troops to a more favorable position to escape the enemy's superior forces or after a defeat | - |
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| (noun) withdrawal for prayer and study and meditation | Synonyms: retirement |
| (noun) the act of withdrawing or going backward (especially to escape something hazardous or unpleasant) | - |
| (noun) an area where you can be alone | Synonyms: hideaway |
| (noun) (military) a bugle call signaling the lowering of the flag at sunset | - |
| (noun) (military) a signal to begin a withdrawal from a dangerous position | - |
| (noun) a place of privacy; a place affording peace and quiet | - |
| retreatant | (noun) a participant in a religious retreat | - |
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| retreated | (noun) people who have retreated | - |
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| sightreader | (noun) a performer who reads without preparation or prior acquaintance (as in music) | - |
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| slipstream | (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, backwash, race, wash |
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| streak | (noun) a narrow marking of a different color or texture from the background | Synonyms: bar, stripe |
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| (noun) a distinctive characteristic | - |
| (noun) a sudden flash (as of lightning) | - |
| (noun) an unbroken series of events | Synonyms: run |
| streaker | (noun) someone who takes off all their clothes and runs naked through a public place | - |
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| stream | (noun) the act of flowing or streaming; continuous progression | Synonyms: flow |
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| (noun) a steady flow of a fluid (usually from natural causes) | Synonyms: current |
| (noun) dominant course (suggestive of running water) of successive events or ideas | Synonyms: current, flow |
| (noun) a natural body of running water flowing on or under the earth | Synonyms: watercourse |
| (noun) something that resembles a flowing stream in moving continuously | Synonyms: flow |
| streambed | (noun) a channel occupied (or formerly occupied) by a stream | Synonyms: creek bed |
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| streamer | (noun) long strip of cloth or paper used for decoration or advertising | Synonyms: banner |
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| (noun) a long flag; often tapering | Synonyms: pennant, pennon, waft |
| (noun) a newspaper headline that runs across the full page | Synonyms: banner |
| (noun) light that streams | - |
| streaming | (noun) the circulation of cytoplasm within a cell | Synonyms: cyclosis |
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| streamlet | (noun) a small stream | Synonyms: rill, rivulet, run, runnel |
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| streamliner | (noun) a streamlined train | - |
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| subtreasury | (noun) a subordinate treasury or place of deposit | - |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| treachery | (noun) an act of deliberate betrayal | Synonyms: betrayal, perfidy, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, perfidy |
| treacle | (noun) writing or music that is excessively sweet and sentimental | Synonyms: glop, mush, slop |
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| (noun) a pale cane syrup | Synonyms: golden syrup |
| tread | (noun) a step in walking or running | Synonyms: pace, stride |
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| (noun) structural member consisting of the horizontal part of a stair or step | - |
| (noun) the part (as of a wheel or shoe) that makes contact with the ground | - |
| (noun) the grooved surface of a pneumatic tire | - |
| treadle | (noun) a lever that is operated with the foot | Synonyms: foot lever, foot pedal, pedal |
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| treadmill | (noun) a job involving drudgery and confinement | Synonyms: salt mine |
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| (noun) a mill that is powered by men or animals walking on a circular belt or climbing steps | Synonyms: tread-wheel, treadwheel |
| (noun) an exercise device consisting of an endless belt on which a person can walk or jog without changing place | - |
| treadwheel | (noun) a mill that is powered by men or animals walking on a circular belt or climbing steps | Synonyms: tread-wheel, treadmill |
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| treason | (noun) a crime that undermines the offender's government | Synonyms: high treason, lese majesty |
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| (noun) an act of deliberate betrayal | Synonyms: betrayal, perfidy, treachery |
| (noun) disloyalty by virtue of subversive behavior | Synonyms: subversiveness, traitorousness |
| treasonist | (noun) someone who betrays his country by committing treason | Synonyms: traitor |
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| treasure | (noun) art highly prized for its beauty or perfection | Synonyms: gem |
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| (noun) a collection of precious things | - |
| (noun) accumulated wealth in the form of money or jewels etc. | Synonyms: hoarded wealth |
| (noun) any possession that is highly valued by its owner | - |
| treasurer | (noun) an officer charged with receiving and disbursing funds | Synonyms: financial officer |
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| treasurership | (noun) the position of treasurer | - |
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| treasury | (noun) a depository (a room or building) where wealth and precious objects can be kept safely | - |
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| (noun) the government department responsible for collecting and managing and spending public revenues | - |
| (noun) the funds of a government or institution or individual | Synonyms: exchequer |
| treat | (noun) an occurrence that causes special pleasure or delight | - |
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| (noun) something considered choice to eat | Synonyms: dainty, delicacy, goody, kickshaw |
| treater | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiant, negotiator |
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| treatise | (noun) a formal exposition | - |
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| treatment | (noun) care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury) | Synonyms: intervention |
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| (noun) the management of someone or something | Synonyms: handling |
| (noun) (medicine) the act of caring for someone (as by medication or remedial training etc.) | Synonyms: therapy |
| (noun) a manner of dealing with something artistically | - |
| (noun) an extended communication (often interactive) dealing with some particular topic | Synonyms: discourse, discussion |
| treaty | (noun) a written agreement between two states or sovereigns | Synonyms: accord, pact |
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