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Is there a name for kanji with the same _on_ and _kun_ reading? I mean kanji
like 労.
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kanji readings
Is there a name for kanji with the same ON and KUN readings?
I'm not sure there are kanji that have the same _on_ and _kun_ reading and if
there are, they would be extremely rare. For this to happen you would have to
have a native Japanese word (at most two morae), which happens to be
pronounced like a _on_ reading (quite unlikely) and that word happens to be
the _on_ reading of the _kanji_ that matches the meaning of the original
Japanese word (extremely unlikely).

For example, か "mosquito" could be an _on_ reading of a kanji. But it's not
the _on_ reading of the kanji that matches the meaning "mosquito", which would
be 蚊【ブン】. So, we get 蚊 with _kun_ reading か and _on_ reading ブン.

* * *

It may happen that the _on_ reading of a single kanji may be used as a word by
itself (e.g. 駅). That doesn't make the reading a _kun_ reading.

Also, sometimes the _on_ reading of a kanji may be used in verbs (e.g. 愛す or
転じる). Even if the verb can be written in hiragana (as in あいす or てんじる), that
doesn't make the reading (あい or てん) a _kun_ reading. These verbs, that look
like

> [ _on_ reading] + す  
>  [ _on_ reading] + じる  
>  [ _on_ reading] + ずる

are fossilized versions of

> [ _on_ reading] + する

as in 勉強する "to study" and you will agree that べんきょう isn't a _kun_ reading of
勉強 just because it appears in べんきょうする.
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A few kanji do have the same on- and kun-readings. In the [joyo-kanji
list](http://kokugo.bunka.go.jp/kokugo_nihongo/joho/kijun/naikaku/kanji/joyokanjisakuin/),

  * [死](http://dictionary.goo.ne.jp/jn/92455/meaning/m0u/)
    * on: シ as in 死亡【シボウ】 (death), 死体【シタイ】 (corpse)
    * kun: 死【し】ぬ (to die)
  * [架](http://dictionary.goo.ne.jp/srch/jn/%E6%9E%B6/m0u/)
    * on: カ as in 高架【コウカ】 (elevated/raised (road)), 担架【タンカ】 (stretcher)
    * kun: 架【か】ける (to build (a bridge))

I don't know the name for this type of kanji. These are probably mere
coincidences and I wonder if this will help people learn Japanese.
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