| konfliktníconflicting; conflict-proneAdjective | Adjective |
| koníčekhobbyNoun | Noun |
| konkrétníspecific; concreteAdjective | Adjective |
| kontaktcontactNoun | Noun |
| kontaktnícontactAdjective | Adjective |
| kontaktovatcontactVerb | Verb |
| kontinentcontinentNoun | Noun |
| kontrolacheck; inspectionNoun | Noun |
| kontrolovatcheck; inspectVerb | Verb |
| konvenceconventionNoun | Noun |
| konverzaceconversationNoun | Noun |
| konvicekettle; jugNoun | Noun |
| konzultaceconsultationNoun | Noun |
| kopechillNoun | Noun |
| kopírkaphotocopierNoun | Noun |
| kopírovatcopyVerb | Verb |
| korespondovatcorrespond; matchVerb | Verb |
| korunacrown; Czech crownNoun | Noun |
| korunovačnícoronationAdjective | Adjective |
| kořeníspice; seasoningNoun | Noun |
| kosmetičkabeauticianNoun | Noun |
| kosmetikacosmetics; beauty careNoun | Noun |
| kostboneNoun | Noun |
| kostelchurchNoun | Noun |
| kostkovanýcheckered; checkedAdjective | Adjective |
| kostniceossuary; bone chapelNoun | Noun |
| kostýmcostume; suitNoun | Noun |
| košíkbasketNoun | Noun |
| košileshirtNoun | Noun |
| kotěkittenNoun | Noun |
| kotelboiler; kettleNoun | Noun |
| kotel na dřevowood-burning boilerWord combination | Word combination |
| kotel na uhlícoal boilerWord combination | Word combination |
| kotníkankleNoun | Noun |
| koukatlook; watchVerb | Verb |
| kouknout sehave a lookPhrase | Phrase |
| koupat sebathe; swimVerb | Verb |
| koupelnabathroomNoun | Noun |
| koupitbuyVerb | Verb |
| kouřenísmokingNoun | Noun |
| kouřitsmokeVerb | Verb |
| kousekpiece; bitNoun | Noun |
| kousíčektiny bit; little pieceNoun | Noun |
| koutcorner; nookNoun | Noun |
| kovmetalNoun | Noun |
| kovárnaforge; smithyNoun | Noun |
| kovovýmetal; metallicAdjective | Adjective |
| kozagoatNoun | Noun |
| kožené zbožíleather goodsWord combination | Word combination |
| koženýleatherAdjective | Adjective |
| krabiceboxNoun | Noun |
| krabičkasmall boxNoun | Noun |
| krádežtheftNoun | Noun |
| krajregionNoun | Noun |
| kraj (místo)edge; side; regionNoun | Noun |
| kraj (správní jednotka)administrative regionNoun | Noun |
| krájetslice; chopVerb | Verb |
| krajinalandscape; countrysideNoun | Noun |
| krajskýregional; provincialAdjective | Adjective |
| králkingNoun | Noun |
| králíčekbunny; little rabbitNoun | Noun |
| králíkrabbitNoun | Noun |
| královstvíkingdomNoun | Noun |
| krásněbeautifullyAdverb | Adverb |
| krásnýbeautifulAdjective | Adjective |
| kraťasyshortsNoun | Noun |
| krátcebrieflyAdverb | Adverb |
| krátkýshortAdjective | Adjective |
| krávacowNoun | Noun |
| kravatatie; necktieNoun | Noun |
| kravičkalittle cowNoun | Noun |
| krbfireplaceNoun | Noun |
| kreativnícreativeAdjective | Adjective |
| kreditnícreditAdjective | Adjective |
| krejčítailorNoun | Noun |
| krejčovstvítailoring; tailor shopNoun | Noun |
| krémcreamNoun | Noun |
| kreslitdrawVerb | Verb |
| KrétakrétaCreteNoun | Noun |
| krevbloodNoun | Noun |
| kriminalistickýforensicAdjective | Adjective |
| kriminálnícriminalAdjective | Adjective |
| kritizovatcriticizeVerb | Verb |
| krizecrisisNoun | Noun |
| krkneckNoun | Noun |
| Krkonošekrkonošethe Giant MountainsNoun | Noun |
| krojcostumeNoun | Noun |
| krokstepNoun | Noun |
| krokodýlcrocodileNoun | Noun |
| kroměbesides, in additionPreposition | Preposition |
| kruhcircleNoun | Noun |
| kruhovýcircular; ring-shapedAdjective | Adjective |
| kruhový objezdroundaboutWord combination | Word combination |
| krvácetbleedVerb | Verb |
| krychlovýcube-shaped; cubicAdjective | Adjective |
| křečekhamsterNoun | Noun |
| křehkýfragile; delicateAdjective | Adjective |
| křesloarmchair; chairNoun | Noun |
| křesťanChristianNoun | Noun |
| křesťankafemale ChristianNoun | Noun |