How to say "part" in Japanese

• 分ぶんJLPT N3approx.Common
  noun, noun (suffix)Covers 'part' as a portion or share — an amount of something, especially when dividing it up or taking one's share. It is about quantity rather than a section of a structure.
  これが君きみの分ぶんのケーキだよ。↗

  Here is your share of the cake.
• 部分ぶぶんJLPT N3approx.Common
  nounThe general word for a part of a larger whole — a section or portion of something, as opposed to the whole itself. Use it when you simply mean 'part of X'.
  オレの醜みにくい部分ぶぶんがオレを引き裂ひきさく。↗

  The ugly side of myself tears me up.
• 側がわJLPT N1approx.Common
  noun, suffixThis is really the word for 'side' — the side of something, or taking someone's side. For 'part' in the sense of a piece or section, it is seldom the word you want.
  こちら側がわでかんでもいいですか。↗

  Can I chew on this side?
• パーツCommon
  nounCovers 'part' as a component: a discrete piece of equipment or machinery, the kind of thing you buy as a replacement. It suits concrete components rather than abstract sections.
  弊社へいしゃは機械きかいパーツの輸入ゆにゅうを行おこなっています。↗

  We specialize in the import of machinery parts.
• 役割やくわりJLPT N3approx.Common
  nounCovers 'part' in the sense of a role — the part someone or something plays in a larger activity, as in 'play a part'. Also used for duties or an allotted role.
  彼かれは自分じぶんの役割やくわりを十二分じゅうにぶんに生いかしていますよ。↗

  He's living his role to the hilt.

Choose 部分 for a part of a whole, 分 for a portion or share, 「パーツ」 for a component, 役割 for a role or the part one plays, and 側 only when you mean a side.

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

• 分ぶんpart
• 部分ぶぶんportion
• 側がわside (of something, or taking someone's side)
• パーツpart
• 役割やくわりpart
• パートpart
• 別れるわかれるto part (usu. of people)
• 箇所かしょplace
• 分けるわけるto divide (into)
• 部位ぶいpart (esp. of the body)
• 局所きょくしょpart
• 一環いっかんlink (e.g. in a chain of events)
• 局部きょくぶpart
• 役回りやくまわりrole
• 離すはなすto separate
• いっかくcorner
• 部局ぶきょくdepartment
• 役柄やくがらrole
• 部材ぶざいcomponent
• 片鱗へんりんpart
• 部分品ぶぶんひんpart
• 袂を分かつたもとをわかつto part (from)
• 一役ひとやくrole (which someone or something plays in a given situation)
• 一半いっぱんhalf
• 構成要素こうせいようそcomponent
• そのpart (as in "part two")
• 部ぶpart
• 役やくpart (in a play, film, etc.)
• ステージstage (phase)
• 一端いったんpart
• 幾分いくぶんsome
• 一翼いちよく(a) role
• ところpassage (in text)
• 節ふし(notable) point
• 点てんpoint
• 幕まくcase
• さばくto untangle