How to say "institution" in Japanese

• 施設しせつJLPT N1approx.Common
  noun, suru verb, transitive verbCovers an institution as a physical establishment such as a care or welfare facility. The emphasis is on the place and its buildings or equipment rather than on the organization as such.
  教育施設きょういくしせつを拡充かくじゅうする金かねをもっと多おおくと望のぞんでいる。↗

  People want more money to expand educational institutions.
• 設置せっちJLPT N1approx.Common
  noun, suru verb, transitive verbIts glosses list establishment and institution, but 設置 really means the act of setting up or installing something, so it is seldom the word you want for an institution itself.
• 制度せいどJLPT N3approx.Common
  nounUsed for an institution in the sense of an established social, legal or economic system, such as marriage or the school system, not for a building or organization.
  新制度しんせいどは成功せいこうだと分わかった。↗

  The new system proved a success.
• インスティテューションCommon
  nounThe direct loanword, used mainly in academic, sociological or economic writing for institutions as established structures or practices; less natural in everyday conversation.
• 機関きかんJLPT N3approx.Common
  nounCovers an institution as an organization or body that carries out some function, such as a public agency or research institution; the focus is on the operating organization.
  この三みっつの機関きかんとは国際通貨基金こくさいつうかききん、国際こくさい復興ふっこう開発銀行かいはつぎんこう、関税かんぜい・貿易ぼうえき一般いっぱん協定きょうていである。↗

  The three organizations are the International Monetary Fund, the International Bank for Reconstruction and Development, and the General Agreement on Tariffs and Trade.

Choose by sense: a physical establishment is 施設, an organization or agency is 機関, an established social or legal system is 制度, while 設置 means the act of installing and 「インスティテューション」 is the borrowed academic term.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 施設しせつfacility
• 設置せっちestablishment
• 制度せいどsystem
• インスティテューションinstitution
• 機関きかんagency
• 院いんinstitution (often medical)