| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| annotator | (noun) a commentator who writes notes to a text | - |
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| attestator | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestor, witness |
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| catatonia | (noun) a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement | Synonyms: catatonic schizophrenia, catatonic type schizophrenia |
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| (noun) extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia | - |
| commentator | (noun) a writer who reports and analyzes events of the day | Synonyms: reviewer |
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| (noun) an expert who observes and comments on something | Synonyms: observer |
| commutator | (noun) switch for reversing the direction of an electric current | - |
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| cunctator | (noun) someone who postpones work (especially out of laziness or habitual carelessness) | Synonyms: postponer, procrastinator |
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| dictator | (noun) a ruler who is unconstrained by law | Synonyms: potentate |
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| (noun) a person who behaves in a tyrannical manner | Synonyms: authoritarian |
| (noun) a speaker who dictates to a secretary or a recording machine | - |
| dictatorship | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, despotism, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| excogitator | (noun) a thinker who considers carefully and thoroughly | - |
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| facilitator | (noun) someone who makes progress easier | - |
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| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
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| imitator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, emulator |
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| (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: impersonator |
| natator | (noun) a person who travels through the water by swimming | Synonyms: bather, swimmer |
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| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| pentatone | (noun) a gapped scale with five notes; usually the fourth and seventh notes of the diatonic scale are omitted | Synonyms: pentatonic scale |
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| potato | (noun) an edible tuber native to South America; a staple food of Ireland | Synonyms: Irish potato, murphy, spud, tater, white potato |
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| (noun) annual native to South America having underground stolons bearing edible starchy tubers; widely cultivated as a garden vegetable; vines are poisonous | Synonyms: Solanum tuberosum, white potato, white potato vine |
| precipitator | (noun) removes dust particles from gases by electrostatic precipitation | Synonyms: Cottrell precipitator, electrostatic precipitator |
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| prestidigitator | (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, illusionist, magician |
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| ratatouille | (noun) a vegetable stew; usually made with tomatoes, eggplant, zucchini, peppers, onion, and seasonings | - |
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| resuscitator | (noun) a breathing apparatus used for resuscitation by forcing oxygen into the lungs of a person who has undergone asphyxia or arrest of respiration | - |
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| salutatorian | (noun) a graduating student with the second highest academic rank; may deliver the opening address at graduation exercises | Synonyms: salutatory speaker |
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| salutatory | (noun) an opening or welcoming statement (especially one delivered at graduation exercises) | Synonyms: salutatory address, salutatory oration |
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| spectator | (noun) a woman's pump with medium heel; usually in contrasting colors for toe and heel | Synonyms: spectator pump |
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| (noun) a close observer; someone who looks at something (such as an exhibition of some kind) | Synonyms: looker, viewer, watcher, witness |
| stator | (noun) mechanical device consisting of the stationary part of a motor or generator in or around which the rotor revolves | Synonyms: stator coil |
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| statoscope | (noun) An instrument that indicates small changes in an aircraft's altitude by recording small variations in atmospheric pressure. | - |
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| sternutator | (noun) a chemical substance that causes sneezing and coughing and crying | Synonyms: sternutatory |
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| sternutatory | (noun) a chemical substance that causes sneezing and coughing and crying | Synonyms: sternutator |
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| tatou | (noun) about three feet long exclusive of tail | Synonyms: giant armadillo, Priodontes giganteus, tatu |
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| tatouay | (noun) naked-tailed armadillo of tropical South America | Synonyms: cabassous, Cabassous unicinctus |
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| testator | (noun) a person who makes a will | Synonyms: testate |
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