| king | (noun) (chess) the weakest but the most important piece | - |
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| (noun) one of the four playing cards in a deck bearing the picture of a king | - |
| (noun) a checker that has been moved to the opponent's first row where it is promoted to a piece that is free to move either forward or backward | - |
| (noun) a male sovereign; ruler of a kingdom | Synonyms: male monarch, Rex |
| (noun) a very wealthy or powerful businessman | Synonyms: baron, big businessman, business leader, magnate, mogul, power, top executive, tycoon |
| (noun) a male competitor who holds a preeminent position | - |
| (noun) the husband or widower of a queen | - |
| (noun) preeminence in a particular category or group or field | - |
| kingbird | (noun) large American flycatcher | Synonyms: Tyrannus tyrannus |
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| kingbolt | (noun) bolt that provides a steering joint in a motor vehicle | Synonyms: kingpin, swivel pin |
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| kingcup | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, butterflower, crowfoot, goldcup |
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| (noun) swamp plant of Europe and North America having bright yellow flowers resembling buttercups | Synonyms: Caltha palustris, cowslip, marsh marigold, May blob, meadow bright, water dragon |
| kingdom | (noun) a basic group of natural objects | - |
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| (noun) a monarchy with a king or queen as head of state | - |
| (noun) the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia | - |
| (noun) the domain ruled by a king or queen | Synonyms: realm |
| (noun) a country with a king as head of state | - |
| (noun) a domain in which something is dominant | Synonyms: land, realm |
| kingfish | (noun) any of several food and game fishes of the drum family indigenous to warm Atlantic waters of the North American coast | - |
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| (noun) large edible mackerel of temperate United States coastal Atlantic waters | Synonyms: cero, pintado, Scomberomorus regalis |
| (noun) small silvery marine food fish found off California | Synonyms: chenfish, Genyonemus lineatus, white croaker |
| (noun) large game fish of Australia and New Zealand | Synonyms: Seriola grandis |
| (noun) the lean flesh of any of several fish caught off the Atlantic coast of the United States | - |
| kingfisher | (noun) nonpasserine large-headed bird with a short tail and long sharp bill; usually crested and bright-colored; feed mostly on fish | - |
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| kinglet | (noun) small birds resembling warblers but having some of the habits of titmice | - |
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| kingmaker | (noun) an important person who can bring leaders to power through the exercise of political influence | - |
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| kingpin | (noun) bolt that provides a steering joint in a motor vehicle | Synonyms: kingbolt, swivel pin |
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| (noun) the front bowling pin in the triangular arrangement of ten pins | Synonyms: headpin |
| (noun) the most important person in a group or undertaking | Synonyms: bigwig, top banana |
| kingship | (noun) the dignity or rank or position of a king | - |
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| kingsnake | (noun) any of numerous nonvenomous North American constrictors; feed on other snakes and small mammals | Synonyms: king snake |
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| kingwood | (noun) Brazilian tree yielding a handsome cabinet wood | Synonyms: Dalbergia cearensis, kingwood tree |
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| (noun) handsome violet-streaked wood of the kingwood tree; used especially in cabinetwork | - |