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There's only one onyomi reading for kanji 学 and its "gaku", where did "gatsu"
come from?
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pronunciation language-change
Why is 学校 pronounced as "gakkou" and not "gakukou"
Historically, 学校 was spelled in kana -- and pronounced as something like --
がくかう. Regular sound changes resulted in modern がっこう:

  * In the ～くか～ in the middle, the //u// sound was unstressed, leading to it gradually being omitted.
  * The //au// vowel combination on the end shifted from //au// (like English _ow!_ ) to //ɔː// (like English _awe_ ) by the early 1600s, as demonstrated by the 1603 [_Nippo Jisho_](https://en.wikipedia.org/wiki/Nippo_Jisho) (Japanese-Portuguese dictionary). This then merged with //oː// (the long "O" sound) between then and the early modern period.
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2021-11-05T19:29:35.773
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