2HONGO

Word Formation & Compounds

Learn how Japanese builds new words through kanji compounds, verb stems, prefixes, and suffixes.

Word Formation & Compounds

Japanese creates most of its vocabulary by combining smaller building blocks — individual kanji, verb stems, and affixes — into compound words. Understanding these patterns lets you decode unfamiliar words on sight and greatly expands your vocabulary.

There are four main word-formation strategies: kanji compounds that fuse characters into new meanings, verb stems that function as nouns, prefixes that modify meaning from the front, and suffixes that change a word's category or add nuance from the end.

Kanji Compounds

Most Japanese nouns are built from two or more kanji, each contributing part of the meaning. Recognizing the individual characters helps you guess compound meanings.

Common patterns:
  • Verb + Object: 食たべ物もの (eat + thing = food), 飲のみ物もの (drink + thing = beverage)
  • Modifier + Noun: 入いり口ぐち (enter + mouth = entrance), 出で口ぐち (exit + mouth = exit)
  • On'yomi compounds: 学がく生せい (study + life = student), 電でん話わ (electric + talk = telephone)
  • Kun + Kun blends: 花はな見み (flower + view = cherry blossom viewing)

On'yomi (Chinese reading) compounds are the most productive — they work like Latin/Greek roots in English, creating formal and technical vocabulary.

Examples

  • 食べ物がたくさんあります。

    There's a lot of food.

  • 入り口はどこですか。

    Where is the entrance?

  • この飲み物は冷たい。

    This drink is cold.

  • 出口は右側にあります。

    The exit is on the right side.
Verb Stems as Nouns

The masu stem (the verb form before ます) often works directly as a noun. This is one of the most productive word-formation patterns in Japanese.

  • 休やすむ → 休やすみ (rest, holiday)
  • 帰かえる → 帰かえり (the return, the way back)
  • 始はじまる → 始はじまり (the beginning)
  • 作つくる → 作つくり (the making, construction)
  • 話はなす → 話はなし (a talk, story)
  • 遊あそぶ → 遊あそび (play, pastime)

These stem-nouns appear everywhere: 買かい物もの (shopping), 食たべ物もの (food), 乗のり換かえ (transfer), 待まち合あわせ (meeting up). Many are so common that learners encounter them as standalone vocabulary before realizing they derive from verbs.

Examples

  • 夏休みはいつですか。

    When is summer vacation?

  • 帰りに買い物をした。

    I did some shopping on the way home.

  • 始まりが一番大事だ。

    The beginning is the most important part.

  • このビルの作りはしっかりしている。

    This building's construction is solid.
Common Prefixes

Prefixes attach to the front of words to add nuance, politeness, or negation.

Beautification / Politeness:
  • お～: attaches to native Japanese (kun'yomi) words: お水みず (water), お名な前まえ (name), お花はな (flower)
  • ご～: attaches to Sino-Japanese (on'yomi) words: ご連れん絡らく (contact), ご家か族ぞく (family), ご意い見けん (opinion)
Negation / Absence:
  • [不](ふ)～: not, un-: 不ふ安あん (anxiety), 不ふ便べん (inconvenient), 不ふ明めい (unclear)
  • [無](む)～: without, -less: 無む料りょう (free of charge), 無む理り (impossible), 無む関かん心しん (indifferent)
  • [未](み)～: not yet: 未み経けい験けん (inexperienced), 未み来らい (future / not-yet-come), 未み定てい (undecided)
Other common prefixes:
  • [再](さい)～: re-, again: 再さい開かい (reopen), 再さい利り用よう (reuse)
  • [超](ちょう)～: super-, ultra-: 超ちょう人じん (superhuman); also used colloquially: 超ちょうおいしい (super delicious)
The お/ご distinction (native vs. Sino-Japanese) has exceptions: お電話, お食事, お時間 use お despite being on'yomi words, because they became fixed polite expressions. When in doubt, listen for what native speakers use — forcing the wrong prefix sounds unnatural.

Examples

  • お水をください。

    Water, please.

  • ご連絡ありがとうございます。

    Thank you for contacting me.

  • 不安な気持ちが消えない。

    I can't shake this feeling of unease.

  • 未経験でも大丈夫ですか。

    Is it okay even without experience?
Common Suffixes

Suffixes attach to the end of words to change their category or add specific meaning.

Category-changing:
  • ～[的](てき): turns nouns into な-adjectives: 国こく際さい的てき (international), 日に本ほん的てき (Japanese-style), 積せっ極きょく的てき (proactive)
  • ～[化](か): turns nouns into する-verbs meaning 'become/make ~': 国こく際さい化か (internationalization), 近きん代だい化か (modernization), 温おん暖だん化か (global warming)
Status / Role:
  • ～[中](ちゅう): during, in the middle of: 営えい業ぎょう中ちゅう (open for business), 工こう事じ中ちゅう (under construction), 勉べん強きょう中ちゅう (studying)
  • ～[者](しゃ): person who does: 責せき任にん者しゃ (person in charge), 研けん究きゅう者しゃ (researcher), 消しょう費ひ者しゃ (consumer)
  • ～[用](よう): for the purpose of: 子こ供ども用よう (for children), 業ぎょう務む用よう (for business use)
Other productive suffixes:
  • ～[性](せい): -ness, -ity (quality): 可か能のう性せい (possibility), 安あん全ぜん性せい (safety)
  • ～[感](かん): sense of, feeling of: 安あん心しん感かん (sense of security), 達たっ成せい感かん (sense of achievement)

Examples

  • 日本的な考え方を学ぶ。

    I'm learning a Japanese way of thinking.

  • 国際化が進んでいる。

    Internationalization is progressing.

  • 営業中の店を探している。

    I'm looking for a shop that's open.

  • 責任者は誰ですか。

    Who is the person in charge?