How to say "replace" in Japanese

• 入れ替えるいれかえるCommon
  ichidan verb, transitive verbReplace or switch one thing with another, often involving several items or a reshuffling. Typical of swapping players, staff, or goods, or replacing equipment wholesale.
  窓まどを開あけてむしむしするこの部屋へやの空気くうきを入れ替いれかえて下ください。↗

  Will you open the window and air out this stuffy room?
• 差し替えるさしかえるCommon
  ichidan verb, transitive verbReplace one specific thing with a ready substitute, as if swapping it in. Common for exchanging a part, a page, an image, or a file for a new version.
• 替えるかえるJLPT N3approx.Common
  ichidan verb, transitive verbA broad 'change or replace' covering conversion or substitution in general. Usable for replacing one thing with another, though 入れ替える and 差し替える often express replacement more precisely.
  お花はなの水みずを替かえましょう。↗

  Shall I change the water for the flowers?
• 替わるかわるJLPT N2approx.Common
  godan verb, intransitive verbThe intransitive counterpart: to be replaced or succeeded, as when a person takes over from another or shifts change hands. Do not use it for the act of replacing something yourself.
  その会社かいしゃは、経営者けいえいしゃが３回かい替かわっている。↗

  The company has changed hands three times.
• 改めるあらためるJLPT N2approx.Common
  ichidan verb, transitive verbPrimarily to revise, alter, or reform rules, systems, or documents, with replacement of old content as a possible outcome. For straightforwardly swapping an object for another, a different word is usually better.
  どうして考かんがえを改あらためたのですか。↗

  What made you change your mind?

For swapping one thing out for another, 「入れ替える」 or 「差し替える」 are the usual choices; 「替える」 is a broader 'change/replace'; 「替わる」 is the intransitive 'be replaced'; 「改める」 centers on revising rather than replacing.

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

• 入れ替えるいれかえるto replace
• 差し替えるさしかえるto change
• 替えるかえるto replace
• 替わるかわるto succeed
• 改めるあらためるto change
• 付け替えるつけかえるto replace
• 買い換えるかいかえるto buy a replacement
• 掛け替えるかけかえるto replace (a picture, sign, hanging scroll, etc.)
• 代置だいちreplace
• すり替えるすりかえるto switch (secretly)
• 置き直すおきなおすto put (something) back in its place
• すげ替えるすげかえるto exchange
• 取って代わるとってかわるto supplant
• 模するもするto imitate
• 模すもすto imitate
• 置き換えるおきかえるto replace
• 取り替えるとりかえるto replace
• 成り代わるなりかわるto replace
• 振るふるto replace