| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| capacitor | (noun) an electrical device characterized by its capacity to store an electric charge | Synonyms: capacitance, condenser, electrical condenser |
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| competitor | (noun) the contestant you hope to defeat | Synonyms: challenger, competition, contender, rival |
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| compositor | (noun) one who sets written material into type | Synonyms: setter, typesetter, typographer |
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| creditor | (noun) a person to whom money is owed by a debtor; someone to whom an obligation exists | - |
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| debitor | (noun) a person who owes a creditor; someone who has the obligation of paying a debt | Synonyms: debtor |
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| depositor | (noun) a person who has deposited money in a bank or similar institution | - |
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| editor | (noun) (computer science) a program designed to perform such editorial functions as rearrangement or modification or deletion of data | Synonyms: editor program |
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| (noun) a person responsible for the editorial aspects of publication; the person who determines the final content of a text (especially of a newspaper or magazine) | Synonyms: editor in chief |
| exhibitor | (noun) someone who organizes an exhibit for others to see | Synonyms: exhibitioner, shower |
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| expositor | (noun) a person who explains | Synonyms: expounder |
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| genitor | (noun) a natural father or mother | - |
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| heritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, inheritor |
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| ignitor | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: igniter, light, lighter |
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| (noun) a substance used to ignite or kindle a fire | Synonyms: igniter, lighter |
| inheritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, heritor |
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| inhibitor | (noun) a substance that retards or stops an activity | - |
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| inquisitor | (noun) a questioner who is excessively harsh | Synonyms: interrogator |
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| janitor | (noun) someone employed to clean and maintain a building | - |
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| monitor | (noun) any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles | Synonyms: monitor lizard, varan |
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| (noun) a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble | - |
| (noun) electronic equipment that is used to check the quality or content of electronic transmissions | - |
| (noun) display produced by a device that takes signals and displays them on a television screen or a computer monitor | Synonyms: monitoring device |
| (noun) someone who gives a warning so that a mistake can be avoided | Synonyms: admonisher, reminder |
| (noun) someone who supervises (an examination) | Synonyms: proctor |
| ovipositor | (noun) egg-laying tubular structure at the end of the abdomen in many female insects and some fishes | - |
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| primogenitor | (noun) an ancestor in the direct line | Synonyms: progenitor |
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| progenitor | (noun) an ancestor in the direct line | Synonyms: primogenitor |
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| servitor | (noun) someone who performs the duties of an attendant for someone else | - |
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| solicitor | (noun) a British lawyer who gives legal advice and prepares legal documents | - |
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| (noun) a petitioner who solicits contributions or trade or votes | Synonyms: canvasser |
| subeditor | (noun) an assistant editor | - |
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| suitor | (noun) a man who courts a woman | Synonyms: suer, wooer |
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| traitor | (noun) someone who betrays his country by committing treason | Synonyms: treasonist |
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| (noun) a person who says one thing and does another | Synonyms: betrayer, double-crosser, double-dealer, two-timer |
| visitor | (noun) someone who visits | Synonyms: visitant |
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