| křesťanskýChristianAdjective | Adjective |
| křestnígiven; first (name)Adjective | Adjective |
| křestní jménofirst name; given nameWord combination | Word combination |
| křičetshout; screamVerb | Verb |
| křišťálcrystalNoun | Noun |
| křišťálovýcrystalAdjective | Adjective |
| křivýcrooked; bentAdjective | Adjective |
| křižovatkacrossroads; intersectionNoun | Noun |
| křížovkacrossword puzzleNoun | Noun |
| kterýwhich, whoPronoun | Pronoun |
| kudrnatýcurlyAdjective | Adjective |
| kudywhich wayAdverb | Adverb |
| kufrsuitcaseNoun | Noun |
| kuchařcookNoun | Noun |
| kuchařkafemale cook; cookbookNoun | Noun |
| kuchařka (kniha)cookbookNoun | Noun |
| kuchyňkitchenNoun | Noun |
| kuchyňská linkakitchen unit; kitchen cupboardsWord combination | Word combination |
| kuchyňskýkitchenAdjective | Adjective |
| kuchyňský koutkitchenette; kitchen cornerWord combination | Word combination |
| kukaččícuckooAdjective | Adjective |
| kulatýroundAdjective | Adjective |
| kulečníkbilliardsNoun | Noun |
| kulturacultureNoun | Noun |
| kulturnículturalAdjective | Adjective |
| kulturní důmcultural house; community centreWord combination | Word combination |
| kůňhorseNoun | Noun |
| kupétrain compartmentNoun | Noun |
| kupovatbuyVerb | Verb |
| kuriozitaoddity; curiosityNoun | Noun |
| kurtcourtNoun | Noun |
| kurz (kurz peněz)exchange rateNoun | Noun |
| kurz (vyučovací kurz)course; classNoun | Noun |
| kuřechickenNoun | Noun |
| kuřecíchickenAdjective | Adjective |
| kuspieceNoun | Noun |
| kutilhandyman; DIY personNoun | Noun |
| kůže (kůže na těle)skinNoun | Noun |
| kůže (materiál)leatherNoun | Noun |
| kvalitaqualityNoun | Noun |
| kvalitníhigh-qualityAdjective | Adjective |
| květenMayNoun | Noun |
| květinaflower; plantNoun | Noun |
| květinářstvíflower shop; florist’sNoun | Noun |
| kvůlibecause ofPreposition | Preposition |
| kykyrykýcock-a-doodle-dooInterjection | Interjection |
| kyselýsourAdjective | Adjective |
| kytaraguitarNoun | Noun |
| kytkaflower; plantNoun | Noun |
| laboratořlaboratoryNoun | Noun |
| láhevbottleNoun | Noun |
| lampalampNoun | Noun |
| lanovkacable carNoun | Noun |
| laserovýlaserAdjective | Adjective |
| láskaloveNoun | Noun |
| laskavýkindAdjective | Adjective |
| látkafabric; materialNoun | Noun |
| léčittreat; cureVerb | Verb |
| léčit sereceive treatment; be treatedVerb | Verb |
| ledenJanuaryNoun | Noun |
| ledničkarefrigerator; fridgeNoun | Noun |
| lednovýJanuaryAdjective | Adjective |
| ledvinakidney; kidneysNoun | Noun |
| legálnělegallyAdverb | Adverb |
| legendalegendNoun | Noun |
| legínyleggingsNoun | Noun |
| legislativalegislationNoun | Noun |
| legracefun; jokeNoun | Noun |
| legračnífunnyAdjective | Adjective |
| lehat silie down; go to bedVerb | Verb |
| lehcelightly; easilyAdverb | Adverb |
| lehkostlightnessNoun | Noun |
| lehkýlightAdjective | Adjective |
| lehnout silie downVerb | Verb |
| lékmedicine; drugNoun | Noun |
| lékárnapharmacyNoun | Noun |
| lékárnicefemale pharmacistNoun | Noun |
| lékárničkafirst aid kitNoun | Noun |
| lékárníkpharmacistNoun | Noun |
| lékařdoctorNoun | Noun |
| lékařkafemale doctor; doctorNoun | Noun |
| lékařské potvrzenímedical certificate; doctor's noteWord combination | Word combination |
| lékařskýmedicalAdjective | Adjective |
| lekcelessonNoun | Noun |
| lektorinstructor; lecturerNoun | Noun |
| lektorkafemale instructor; instructorNoun | Noun |
| lesforestNoun | Noun |
| letflightNoun | Noun |
| léta (rok)yearsNoun | Noun |
| letadloplane; airplaneNoun | Noun |
| létatflyVerb | Verb |
| leteckyby airAdverb | Adverb |
| letenkaplane ticketNoun | Noun |
| letětflyVerb | Verb |
| letištěairportNoun | Noun |
| letnísummerAdjective | Adjective |
| létosummerNoun | Noun |
| letosthis yearAdverb | Adverb |
| letovýflightAdjective | Adjective |
| letový řádflight scheduleWord combination | Word combination |