| abnegator | (noun) one who gives up or relinquishes or renounces something | - |
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| abrogator | (noun) an authority or official empowered to abolish or annul or repeal | - |
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| aggregator | (noun) a person who collects things | Synonyms: collector |
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| alligator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: gator |
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| (noun) leather made from alligator's hide | - |
| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| astrogator | (noun) the navigator of a spacecraft | - |
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| expurgator | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdleriser, bowdlerizer |
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| fumigator | (noun) a device that generates a gas for the purpose of disinfecting or eradicating pests | - |
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| (noun) someone whose job is to fumigate | - |
| gator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: alligator |
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| gigatonne | (noun) a unit of weight equivalent to 1 billion tonnes. | Synonyms: Gt |
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| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
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| (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, provoker |
| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
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| interrogatory | (noun) formal systematic questioning | Synonyms: examination, interrogation |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| litigator | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigant |
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| megaton | (noun) one million tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT | - |
| navigator | (noun) in earlier times, a person who explored by ship | - |
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| (noun) the member of an aircrew who is responsible for the aircraft's course | - |
| (noun) the ship's officer in charge of navigation | Synonyms: sailing master |
| obbligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obligato |
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| (noun) a persistent but subordinate motif | Synonyms: obligato |
| obligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obbligato |
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| (noun) a persistent but subordinate motif | Synonyms: obbligato |
| promulgator | (noun) (law) one who promulgates laws (announces a law as a way of putting it into execution) | - |
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| propagator | (noun) someone who spreads the news | Synonyms: disseminator |
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| (noun) someone who propagates plants (as under glass) | - |
| purgatory | (noun) (theology) in Roman Catholic theology the place where those who have died in a state of grace undergo limited torment to expiate their sins | - |
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| (noun) a temporary condition of torment or suffering | - |
| rigatoni | (noun) tubular pasta in short ribbed pieces | - |
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| segregator | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregationist |
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| subjugator | (noun) a conqueror who defeats and enslaves | - |
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