Translation guide
A small device inserted into the ear canal to block noise, water, or protect hearing.
耳栓
earplug (general)
A plug inserted into the ear to reduce or block sound, used for sleeping, studying, concerts, etc.
The most common and general term for earplugs used to block noise.
隣の部屋がうるさいので、耳栓をして寝ます。
The next room is noisy, so I'll sleep with earplugs.
工事の音が気になるなら、耳栓を使うといいですよ。
If the construction noise bothers you, you should use earplugs.
Loanword from English, used in some contexts but less common than 耳栓.
イヤープラグを買って、飛行機の中で使った。
I bought earplugs and used them on the plane.
A plug used to prevent water from entering the ear during swimming or bathing.
The same word 耳栓 is used for both noise and water protection. Context clarifies the type.
水泳のときに耳栓をしないと、耳が痛くなります。
If you don't wear earplugs when swimming, your ears will hurt.
Specifically 'waterproof earplugs', used when distinction is needed.
防水耳栓は薬局で買えます。
You can buy waterproof earplugs at the pharmacy.
Earplugs used in loud environments like factories or concerts to protect hearing.
Again, 耳栓 covers this meaning. Often used with verbs like 着用する (to wear).
工場では耳栓の着用が義務付けられています。
Wearing earplugs is mandatory in the factory.
Specifically 'soundproof earplugs', used in industrial or safety contexts.
防音耳栓をしないと、耳を傷める可能性があります。
If you don't wear soundproof earplugs, you could damage your ears.
耳栓 is a versatile word that covers most types of earplugs. To specify the purpose, you can add a prefix like 防音 (soundproof) or 防水 (waterproof), but in everyday conversation, 耳栓 alone is usually sufficient.