On’yomi and Kun’yomi: Why Kanji Have Different Readings
Use real words built with 山, 水, and 人 to understand the two reading categories—and learn why the whole word matters more than a one-reading rule.
Start with a word you can hear
山 as the word “mountain” is commonly read やま. The 山 in 富士山 is read さん. The character has not changed; it appears in a different word with a different established reading.
The labels on’yomi and kun’yomi help organize this information. They do not tell you to pronounce every occurrence of a character the same way. Learn a word’s spelling, reading, and meaning together before trying to generalize from it.
| Kanji | A kun’yomi example | An on’yomi example |
|---|---|---|
| 山 | 山 (やま), mountain | 火山 (かざん), volcano |
| 水 | 水 (みず), water | 水道 (すいどう), water supply |
| 人 | 人 (ひと), person | 人口 (じんこう), population |
Two kanji do not guarantee an on’yomi reading
Many compounds use on’yomi, but 山道 is やまみち, “mountain path,” with kun’yomi readings. Other words mix reading types, and some have conventional readings that do not split neatly into a separate pronunciation for each character.
This is why a rule such as “one kanji means kun’yomi, two means on’yomi” will soon fail. Use patterns to notice connections, then confirm the actual word instead of forcing it to fit the pattern.
山の水は冷たいです。
Look up the word before the character
When reading, search for the complete unfamiliar word first. Find its reading and meaning, then look at the individual kanji if you want to understand the pattern behind it. Names and place names deserve particular care.
A dictionary may display on’yomi in katakana and kun’yomi in hiragana. That is a labeling convention, not an instruction to write on’yomi words in katakana in ordinary prose.
Build a network of useful vocabulary
Instead of memorizing every listed reading of 水 at once, learn 水, みず, “water,” and 水道, すいどう, “water supply,” as words. Read them in sentences. When you meet a new word containing 水, add that example to what you already know.
A reading check
How is 山 read in 山道 and 火山? The complete readings are やまみち and かざん. Noticing the different role of 山 is useful, but remembering the words is what lets you read them. Use furigana to check your recall when a reading guide is available.
