Translation guide
A small device inserted into the ear canal to block noise, water, or protect hearing.
earplug (general)
A plug inserted into the ear to reduce or block sound, used for sleeping, studying, concerts, etc.
The next room is noisy, so I'll sleep with earplugs.
If the construction noise bothers you, you should use earplugs.
Loanword from English, used in some contexts but less common than 耳栓.
I bought earplugs and used them on the plane.
A plug used to prevent water from entering the ear during swimming or bathing.
Earplugs used in loud environments like factories or concerts to protect hearing.
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.
You can buy waterproof earplugs at the pharmacy.
If you don't wear soundproof earplugs, you could damage your ears.