How to say "experiment" in Japanese

• 実験じっけんJLPT N3approx.Common
  noun, suru verb, transitive verbThis is the word for an experiment in the scientific sense — a procedure carried out to test a hypothesis or see what happens, as in laboratories and research. It also covers experimentation generally.
  実験じっけんは成功せいこうだった。↗

  The experiment was successful.
• 試作しさくCommon
  noun, suru verb, transitive verbThis word is really about trial manufacture: making a prototype or test piece of a new product. For an experiment in the usual sense it is seldom the word you want.
• 試みこころみJLPT N1approx.Common
  nounCovers 'experiment' in the sense of an attempt or trial — trying something new to see how it works, as in a bold experiment in education. For a scientific procedure, 実験 is the word.
  私わたしたちの試こころみはすべて無駄むだだった。↗

  All our attempts were in vain.
• 試験しけんJLPT N4approx.Common
  noun, suru verb, transitive verbIts 'experiment' sense is a trial or test of how something performs — checking quality, capability or endurance. It also means a test or examination; for a scientific experiment, 実験 is the word to use.

Choose 実験 for scientific experiments, 「試み」 for attempts or trials of something new, 試験 for tests of performance or quality, and 試作 only for trial manufacture or prototypes.

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

• 実験じっけんexperiment
• 試作しさくtrial manufacture
• 試みこころみattempt
• エクスペリメントexperiment
• 試しtesting
• 試験しけんtrial