How to say "reconstruction" in Japanese

• 改造かいぞうJLPT N2approx.Common
  noun, suru verb, transitive verbCovers remodeling or converting something, such as rebuilding a machine or structure to a new design. It implies changing rather than restoring, so it suits 'reconstruction' only in that converted, altered sense.
  地下室ちかしつを仕事場しごとばに改造かいぞうした。↗

  The basement has been made over into a workshop.
• 復興ふっこうJLPT N1approx.Common
  noun, suru verb, transitive verb, intransitive verbThe word for rebuilding after war, earthquake, or other disaster — reconstructing a city or an economy. This is the natural choice when 'reconstruction' means recovery on a large scale.
  それはさらにいっそうの活力かつりょくで復興ふっこうした。↗

  It revived with even greater vigor.
• 復元ふくげんCommon
  noun, suru verb, transitive verb, intransitive verbMeans restoring something to its original state or location, such as reconstructing a historical building or artifact from evidence. It implies a faithful return to how things once were, not renovation.
  その塔とうを復元ふくげんしてはどうかと提案ていあんされた。↗

  It was suggested that the tower be restored.
• 再建さいけんJLPT N1approx.Common
  noun, suru verb, transitive verbRebuilding or rehabilitating something that has failed or collapsed, such as a company, an economy, or a damaged structure. It emphasizes putting back what was lost and making it work again.
  その城しろは、１４８５年ねんに全焼ぜんしょうして、再建さいけんされなかった。↗

  The castle, burnt down in 1485, was not rebuilt.
• 改築かいちくCommon
  noun, suru verb, transitive verbStrictly a construction term: structurally altering or rebuilding a building itself. If your 'reconstruction' is about bricks and beams rather than a metaphorical rebuilding, this is the word.
  わが家やは全面的ぜんめんてきに改築かいちくされた。↗

  Our house was entirely rebuilt.

Choose 改造 or 改築 for rebuilding structures, 復興 for recovery after disasters or war, 復元 for restoring something to its original state, and 再建 for rebuilding organizations or economies.

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

• 改造かいぞうremodeling
• 復興ふっこうrevival
• 復元ふくげんrestoration (to the original state or location)
• 再建さいけんrebuilding
• 改築かいちくstructural alteration (of a building)
• 建て替えたてかえrebuilding
• リコンストラクションreconstruction
• 再建築さいけんちくreconstruction
• 再工事さいこうじreconstruction
• 再構成さいこうせいreconstruction
• 再構築さいこうちくreconstruction
• 再築さいちくreconstruction
• リビルドrebuild
• 復元品ふくげんひんreproduction