| chrámtempleNoun | Noun |
| chřipkafluNoun | Noun |
| chtítwantVerb | Verb |
| chudýpoorAdjective | Adjective |
| chuťtaste, appetiteNoun | Noun |
| chutnattaste good; like the tasteVerb | Verb |
| chutnýtastyAdjective | Adjective |
| chvílemoment, whileNoun | Noun |
| chvilkalittle momentNoun | Noun |
| chybamistake, errorNoun | Noun |
| chybětbe missing; be absentVerb | Verb |
| chytatcatchVerb | Verb |
| chytrýsmart; cleverAdjective | Adjective |
| iand, alsoConjunction | Conjunction |
| ideálníidealAdjective | Adjective |
| idiotidiotNoun | Noun |
| idylaidyllNoun | Noun |
| ikonaiconNoun | Noun |
| imperfektivníimperfectiveAdjective | Adjective |
| inanimatuminanimate nounNoun | Noun |
| indickýIndianAdjective | Adjective |
| IndieindieIndiaNoun | Noun |
| indonéskýIndonesianAdjective | Adjective |
| infarktheart attackNoun | Noun |
| infocentruminformation centerNoun | Noun |
| informaceinformationNoun | Noun |
| informačníinformationAdjective | Adjective |
| informatičkafemale IT specialistNoun | Noun |
| informatikIT specialistNoun | Noun |
| informatikacomputer science, ITNoun | Noun |
| informovatinformVerb | Verb |
| Ing.ing.Ing. engineering titleNoun | Noun |
| ingredienceingredient, ingredientsNoun | Noun |
| iniciovatinitiate; startVerb | Verb |
| injekceinjectionNoun | Noun |
| inspiraceinspirationNoun | Noun |
| inspirovanýinspiredAdjective | Adjective |
| inspirovatinspireVerb | Verb |
| instalatérplumberNoun | Noun |
| instalovatinstallVerb | Verb |
| inteligenceintelligenceNoun | Noun |
| inteligentnísmart, intelligentAdjective | Adjective |
| internátníboardingAdjective | Adjective |
| internetinternetNoun | Noun |
| internetovýinternetAdjective | Adjective |
| interníinternalAdjective | Adjective |
| intuiceintuitionNoun | Noun |
| invalidníinvalid; not validAdjective | Adjective |
| investičníinvestmentAdjective | Adjective |
| inzerátadvertisement, listingNoun | Noun |
| IslandislandIcelandNoun | Noun |
| ItalitalItalian man, Italian personNoun | Noun |
| ItálieitálieItalyNoun | Noun |
| ItalkaitalkaItalian woman, Italian personNoun | Noun |
| italskyin ItalianAdverb | Adverb |
| italštinaItalianNoun | Noun |
| jáIPronoun | Pronoun |
| jablkoappleNoun | Noun |
| jahodastrawberryNoun | Noun |
| jahodovýstrawberryAdjective | Adjective |
| jachtayachtNoun | Noun |
| jakhowAdverb | Adverb |
| jakoas, likeConjunction | Conjunction |
| jakýwhat kind, howPronoun | Pronoun |
| jakžtakžso-soAdverb | Adverb |
| JaponecjaponecJapanese man, Japanese personNoun | Noun |
| JaponkajaponkaJapanese woman, Japanese personNoun | Noun |
| JaponskojaponskoJapanNoun | Noun |
| japonskyin JapaneseAdverb | Adverb |
| japonštinaJapaneseNoun | Noun |
| jarníspringAdjective | Adjective |
| jarospringNoun | Noun |
| jasněclearly, sureAdverb | Adverb |
| jasnoclearAdverb | Adverb |
| jasnýclear; obviousAdjective | Adjective |
| játraliverNoun | Noun |
| jazyk (část těla)tongueNoun | Noun |
| jazyk (řeč)languageNoun | Noun |
| jazykovýlanguageAdjective | Adjective |
| jazykylanguagesNoun | Noun |
| jazzjazzNoun | Noun |
| jazzklubjazz clubNoun | Noun |
| jazzovýjazzAdjective | Adjective |
| jégeeInterjection | Interjection |
| jedenoneNumber | Number |
| jedenáctelevenNumber | Number |
| jedinýonly; singleAdjective | Adjective |
| jednánínegotiationsNoun | Noun |
| jednatelmanaging directorNoun | Noun |
| jednatelkafemale managing directorNoun | Noun |
| jedničkanumber one, grade ANoun | Noun |
| jednoduchýsimpleAdjective | Adjective |
| jednohubkacanape, small biteNoun | Noun |
| jednolůžkovýsingle-roomAdjective | Adjective |
| jednotlivěindividuallyAdverb | Adverb |
| jednouonceNumber | Number |
| jedovatýpoisonousAdjective | Adjective |
| jehohisPronoun | Pronoun |
| jelendeer, stagNoun | Noun |
| jemnýdelicate; fine; gentleAdjective | Adjective |