How to say "compound" in Japanese

• 境内けいだいCommon
  nounThe spatial 'compound' of religious sites: the enclosed precincts and grounds of a shrine or temple, extending to a churchyard. For a factory, campus, or military compound, 構内 is the better fit.
• 複ふくCommon
  prefixNot a standalone word: it is essentially a combining element meaning 'multiple' or 'composite', with a prefix-like 're-' gloss. As a free-standing translation of 'compound' it is seldom the word you want.
• 化合物かごうぶつCommon
  nounThe chemistry term: a chemical compound, a substance made of two or more chemically combined elements. This is the only word here for that scientific meaning of 'compound'.
  工場こうじょうでは複雑ふくざつな化学かがく化合物かごうぶつを製造せいぞうしている。↗

  The plants manufacture complex chemical compounds.
• 混ぜ合わすまぜあわすCommon
  godan verb, transitive verbThe verb: to compound in the literal sense of mixing or blending ingredients together. It does not extend to the figurative 'compound' meaning to make a bad situation worse.
  彼女かのじょはバターと砂糖さとうを混ぜ合まぜあわせた。↗

  She mixed the butter and sugar together.
• 構内こうないCommon
  nounThe spatial 'compound' of general facilities: the enclosed premises or grounds of a factory, station, campus, or similar site. For shrine and temple compounds, use 境内 instead.
  構内こうないで昨日きのう彼女かのじょに会あったよ。↗

  I met her on campus yesterday.

For a chemical substance use 化合物; for the verb 'to mix or blend' use 「混ぜ合わす」; for an enclosed site use 構内 (facilities) or 境内 (shrines and temples); 複 is merely a combining element.

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

• 境内けいだいgrounds (esp. of shrines and temples)
• 複ふくcompound
• 化合物かごうぶつcompound
• 混ぜ合わすまぜあわすto mix together
• 構内こうないpremises
• コンパウンドcompound
• 合成物ごうせいぶつcompound
• 混成物こんせいぶつmixture