How to say "bump" in Japanese

• こぶCommon
  nounA raised lump or swelling on a surface, such as a bump on the head or skin. The usual everyday word for this sense, and typically written in kana alone.
  ラクダは背中せなかのこぶに大量たいりょうの脂肪しぼうをためることができる。↗

  A camel can store a large amount of fat in the hump on its back.
• 突起とっきCommon
  noun, suru verb, intransitive verbA protuberance, projection, or protrusion — something sticking out from a surface. More technical or descriptive than こぶ, suited to anatomy, geography, or mechanical features.
• でこCommon
  nounA colloquial word for a bump, especially the kind that rises on the head after a knock. Casual speech; こぶ is the more general choice.
• レシーブCommon
  noun, suru verb, transitive verbOnly the volleyball sense of 'bump' — the forearm pass used to receive a serve or spike. It is not a general word for bumps; outside volleyball it is not the word you want.

Use 「こぶ」 for a raised lump or swelling, 突起 for a protuberance or projection, 「でこ」 colloquially for a bump especially on the head, and 「レシーブ」 only for the volleyball move.

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

• こぶbump
• 突起とっきprotuberance
• バンプbump
• たんこぶbump (e.g. on forehead)
• どすっとthump
• でこbump
• レシーブbump (in volleyball)
• 段差だんさdifference in level (e.g. road, footpath)