| congener | (noun) a whole (a thing or person) of the same kind or category as another | - |
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| (noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) | Synonyms: congenator, congeneric, relative |
| (noun) a minor chemical constituent that gives a wine or liquor its distinctive character | - |
| convener | (noun) the member of a group whose duty it is to convene meetings | - |
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| dampener | (noun) a device that dampens or moistens something | Synonyms: moistener |
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| enlivener | (noun) an agent that gives or restores life or vigor | Synonyms: invigorator, quickener |
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| fastener | (noun) restraint that attaches to something or holds something in place | Synonyms: fastening, fixing, holdfast |
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| (noun) a person who fastens or makes fast | - |
| freshener | (noun) anything that freshens | - |
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| gardener | (noun) someone who takes care of a garden | Synonyms: nurseryman |
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| (noun) someone employed to work in a garden | - |
| hardener | (noun) one that hardens, especially a substance added to varnish or paint to give it a harder surface or finish. | - |
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| kindergartener | (noun) a child who attends a preschool or kindergarten | Synonyms: kindergartner, preschooler |
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| larcener | (noun) a person who commits larceny | Synonyms: larcenist |
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| lightener | (noun) any type of lightening agent that can be used to brighten the appearance of hair, skin, wood and other surfaces. | - |
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| listener | (noun) someone who listens attentively | Synonyms: attender, auditor, hearer |
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| meshuggener | (noun) (Yiddish) a crazy fool | Synonyms: meshuggeneh |
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| moistener | (noun) a device that dampens or moistens something | Synonyms: dampener |
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| opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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| (noun) the first event in a series | - |
| (noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
| quickener | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, invigorator |
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| screener | (noun) a guard at an airport who checks passengers or their luggage at a security checkpoint | - |
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| scrivener | (noun) someone employed to make written copies of documents and manuscripts | Synonyms: copyist, scribe |
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| sevener | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, heptad, septenary, septet, seven, VII |
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| sharpener | (noun) any implement that is used to make something (an edge or a point) sharper | - |
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| shortener | (noun) any agent that shortens | - |
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| softener | (noun) a substance added to another to make it less hard | - |
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| stiffener | (noun) a member attached to a beam web to prevent loss of strength due to web buckling. | - |
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| (noun) material used for stiffening something | - |
| straightener | (noun) a device for straightening | - |
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| strengthener | (noun) a device designed to provide additional strength | Synonyms: reinforcement |
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| sweetener | (noun) anything that serves as an enticement | Synonyms: bait, come-on, hook, lure |
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| (noun) something added to foods to make them taste sweeter | Synonyms: sweetening |
| thickener | (noun) any material used to thicken | Synonyms: thickening |
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| unfastener | (noun) a person who unfastens or unwraps or opens | Synonyms: opener, undoer, untier |
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| warrener | (noun) maintains a rabbit warren | - |
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| weakener | (noun) that which weakens or causes a loss of strength | - |
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| whitener | (noun) an agent that makes things white or colorless | Synonyms: blanching agent, bleach, bleaching agent |
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| wiener | (noun) a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll | Synonyms: dog, frank, frankfurter, hot dog, hotdog, weenie, wienerwurst |
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