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Japanese · Upper grammar · B1 to B2

Kanji compounds: reading words you have never seen

電electric+車vehicle電車densha · train火fire+山mountain火山kazan · volcano読read+書writing読書dokusho · reading (books)不not+便convenient不便fuben · inconvenient
Japanese readers do this all the time: a new word in the news is usually guessable from its kanji.

Short answer: most Japanese vocabulary beyond the basics is made of two-kanji compounds (熟語 jukugo), usually read with on readings. They are built in a handful of regular ways: two similar meanings (道路, road), opposites (売買, buying and selling), a describer + noun (電車), or a verb + object (読書, reading books). Learn the patterns and the common prefixes and suffixes, and you can guess many new words from their parts.

Five ways kanji combine

Most compounds fit one of these.

Similar meanings
Opposites
Describer + noun
Verb + object
Subject + verb

Negative prefixes

Four kanji turn a word into its opposite or absence.

CompoundMeaningPrefix
fubeninconvenient不 not
fuananxiety不 not
muryōfree of charge無 without
muriimpossible無 without
miraithe future未 not yet
miteiundecided未 not yet
hijōemergency; extreme非 non-
hikōkainot public非 non-

Common suffixes

These make new words from existing compounds, a bit like English -ic, -ise or -er.

Sound changes when kanji join

Readings sometimes change at the join: a small っ appears (学 + 校 → がっこう), or the second word’s first sound is voiced (rendaku): 手 + 紙 → てがみ.

Three- and four-kanji words

Longer words are usually two compounds joined, or a compound plus a suffix.

Same sound, different kanji

Kango has many words with the same sound. Kanji, and context, tell them apart.

WordMeaningSound
kikaiopportunitykikai
kikaimachinekikai
shōkaiintroductionshōkai
shōkaiinquiryshōkai
kōenparkkōen
kōenlecturekōen

Abbreviated compounds

Long names are shortened to two or four kanji, especially in news.

Check yourself

Read each word and guess its meaning, then open the answer.

  1. Read: 電車
    Show answer
    denshaelectric + vehicle = train
  2. Read: 入口
    Show answer
    iriguchienter + mouth = entrance
  3. Read: 無料
    Show answer
    muryōwithout + fee = free
  4. Read: 学校
    Show answer
    gakkōsmall っ at the join
  5. Read: 手紙
    Show answer
    tegamiかみ → がみ (rendaku)

Guess the meaning

Try each one from its parts before pressing to hear it and reading the answer.

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