How to say "observation" in Japanese

Choosing the right word
  • 観察かんさつJLPT N3approx.Common
    noun, suru verb, transitive verbCovers observation in the basic sense of watching something carefully to learn about it, such as studying animal behavior or natural phenomena; the natural choice for deliberate, attentive watching.
    科学かがくは観察かんさつに基もとづいている。↗
    Science rests upon observation.
  • 観測かんそくJLPT N2approx.Common
    noun, suru verb, transitive verbObservation as a technical act of measuring and recording data, as in weather or astronomical observation; choose this when the emphasis is on taking measurements rather than simply watching.
    ジャンスキーが観測かんそくしたのは銀河系ぎんがけいの中心ちゅうしん核かくからの波長はちょう14.6mの電波でんぱであった。↗
    What Jansky had observed was the 14.6m wavelength radio wave from the Milky Way's core.
  • 注目ちゅうもくJLPT N3approx.Common
    noun, suru verb, transitive verb, intransitive verbHere 'observation' means close attention or notice rather than systematic study; it is the word for paying attention to someone or something, often because it seems important or noteworthy.
    ご注目ちゅうもく下ください。↗
    Please give me your attention.
  • 発言はつげんJLPT N1approx.Common
    noun, suru verb, transitive verb, intransitive verbCovers 'observation' in the sense of a remark or statement made in speech, such as a comment offered during a meeting or debate; it has nothing to do with watching.
    ジムはよけいな発言はつげんをした。↗
    Jim made a superfluous remark.
  • 監視かんしJLPT N1approx.Common
    noun, suru verb, transitive verbObservation as continuous watching or surveillance, such as surveillance of a suspect or monitoring of a computer system; the nuance is keeping watch over something rather than studying it.
    He is a sanitary inspector.

Use 観察 for careful watching and examining, 観測 for measurement-based scientific observation, 注目 for paying close attention, 発言 for a spoken remark, and 監視 for surveillance or monitoring.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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