メカニズムmekanizumu

1. nounmechanism
   この機械きかいのメカニズムは複雑ふくざつです。↗

   The mechanism of this machine is complicated.

• Synonym機構きこうWrittenWritten/formal prose noun for an organization or the structure of a machine, as in 「国際機構」; leans formal, unlike the neutral 「メカニズム」.
• SynonymメカCasualColloquial loanword for machinery or mecha (robots and the like), as in 「メカ好き」; it has a casual ring that 「メカニズム」 does not.
• Synonym仕組みしくみNeutralNeutral, everyday word for how a thing is put together and works, as in 「社会の仕組み」; the common choice in daily speech where 「メカニズム」 sounds technical.
• Synonym仕掛けしかけNeutralNeutral noun for a contrivance or a trick, as in 「種も仕掛けもない」; it names the device or ploy itself, while 「メカニズム」 names how something works.
• SynonymからくりNeutralNeutral noun for a mechanical contrivance or the trick hidden behind it, as in 「からくり人形」; it carries a sense of concealment that 「メカニズム」 lacks.
• RelatedシステムNeutralNeutral loanword for a system as a connected whole, as in 「システム障害」; stresses the overall setup rather than the inner workings of 「メカニズム」.
• Related機序きじょWrittenWritten/formal prose term for the mechanism of a medical or biological action, as in 「作用機序」; a specialist word, narrower than 「メカニズム」.

Use 「メカニズム」 for the mechanism behind how something works, as in 「発生のメカニズム」. In everyday talk prefer 「仕組み」; for medical mechanisms use 「機序」; for organizations 「機構」; for devices and tricks 「仕掛け」 or 「からくり」.

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

1. 機構きこう。
2. 手法しゅほう。