How to say "similarity" in Japanese

• 類似るいじJLPT N1approx.Common
  suru verb, intransitive verb, no-adjectiveThe broad everyday word for resemblance or similarity between two things, including likenesses in ideas or situations; it also covers the sense of analogy.
  この構成こうせいにおいて、三角形さんかっけいの代かわりに長方形ちょうほうけいを用もちいても類似るいじの困難こんなんが生しょうずる。↗

  We encounter similar difficulties when we substitute rectangles for triangles in this configuration.
• 相似そうじCommon
  na-adjective, no-adjectiveCovers similarity, but in careful usage it most often refers to similarity of shape or figure, as in geometry; for general resemblance 類似 is usually the better choice.

Use 類似 for general resemblance or likeness between things, and 相似 when talking about geometric similarity or correspondence in shape, as in mathematics.

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

• 類似るいじresemblance
• 似寄りによりsimilarity
• 相似点そうじてんpoint of likeness (between)
• 類似性るいじせいresemblance
• 類似点るいじてん(point of) similarity
• 相似そうじsimilarity