後部|こうぶkoubu[1]atamadaka (head-high)

1. no-adjectiverear; stern
   ハイジャック犯はん達たちは飛行機ひこうきの後部こうぶに移うつった。↗

   The hijackers moved to the rear of the plane.

• Synonym後方こうほうWrittenA written word for the direction or area behind a position. 「後部」 refers to the rear part of an object itself.
• SynonymリアCasualA colloquial loanword for the rear of a vehicle, as in 「リアウインドウ」. 「後部」 is a Sino-Japanese word.
• Synonym後あとWrittenRead しりえ, an archaic word for the rear with an old-fashioned flavor. In modern Japanese use 「後方」 or 「後部」.
• Synonym後ろうしろNeutralThe most common word for the back; covers both position and direction. 「後部」 only refers to the rear part of an object.
• Synonym後ろ側うしろがわCasualColloquial term for the back side of something. 「後部」 is mostly used for the rear part of a vehicle or object, as in 「後部座席」.
• Synonym後尾こうびWrittenA written word for the tail end of a line or procession. 「後部」 is mostly used for the rear of objects.
• Related後ろうしろNeutralThe most common word for the back; covers both position and direction. 「後部」 only refers to the rear part of an object.
• Related背後はいごWrittenA written word for behind something or behind the scenes, as in 「背後関係」. 「後部」 is mostly used for the rear part of objects.
• Related背面はいめんWrittenA written word for the back face of an object, or a hidden side of a matter. 「後部」 only refers to the rear portion of an object.
• RelatedバックCasualA colloquial loanword for the back, a background, or backing and support. 「後部」 is mostly used for the rear part of objects.
• Related陰かげNeutralShade or the space behind something; also secrecy. 「後部」 is mostly used for the rear part of objects.
• Related背中せなかNeutralA person's back. 「後部」 is mostly used for the rear of vehicles or objects.
• Related背せNeutralThe back, or height, as in 「背が高い」. 「後部」 is mostly used for objects.
• Related尻しりNeutralThe buttocks; also the end or last place. 「後部」 is the written, Sino-Japanese term for the rear part of an object.
• Related後列こうれつNeutralThe back row, as in 「後列の席」. 「後部」 is mostly used for objects.
• Related後面こうめんWrittenA written word for the rear face of an object. 「後部」 covers the rear portion as a whole, not just one face.
• Related後背こうはいWrittenA written word for the area behind or at the back. 「後部」 is mostly used for the rear part of objects.
• Related後方しりえWrittenA written word for the direction or area behind a position. 「後部」 refers to the rear part of an object itself.
• Related背部はいぶWrittenA written word for the back of a person's body. 「後部」 is mostly used for objects.
• Antonym前部ぜんぶNeutralThe front part; the positional opposite of 「後部」.
• Antonym先頭せんとうNeutralThe very front, as in 「先頭を走る」; fits both speech and writing. The opposite of 「後部」.

Use 「後部」 for the rear part of a vehicle or object, as in 「後部座席」 or 「機体後部」. For the back in general say 「後ろ」; for the direction or area behind, 「後方」; for the back face of something, 「背面」; for the rear of a car, 「リア」. The opposite is 「前部」.

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

1. 後うしろの部分ぶぶん。