| keel | (noun) one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability | - |
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| (noun) the median ridge on the breastbone of birds that fly | - |
| (noun) a projection or ridge that suggests a keel | - |
| keelboat | (noun) river boat with a shallow draught and a keel but no sails; used to carry freight; moved by rowing or punting or towing | - |
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| keelson | (noun) a longitudinal beam connected to the keel of ship to strengthen it | - |
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| keen | (noun) a funeral lament sung with loud wailing | - |
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| keenness | (noun) thinness of edge or fineness of point | Synonyms: sharpness |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, acuteness, sharpness |
| (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, avidness, eagerness |
| keep | (noun) the main tower within the walls of a medieval castle or fortress | Synonyms: donjon, dungeon |
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| (noun) a cell in a jail or prison | Synonyms: hold |
| (noun) the financial means whereby one lives | Synonyms: bread and butter, livelihood, living, support, sustenance |
| keeper | (noun) one having charge of buildings or grounds or animals | Synonyms: custodian, steward |
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| (noun) someone in charge of other people | - |
| keeping | (noun) the responsibility of a guardian or keeper | Synonyms: guardianship, safekeeping |
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| (noun) conformity or harmony | - |
| (noun) the act of retaining something | Synonyms: holding, retention |
| keepsake | (noun) something of sentimental value | Synonyms: relic, souvenir, token |
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| keeshond | (noun) a spitz-like dog having a shaggy greyish coat and tightly curled tail originating in Holland | - |
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