IPA: /ˈɪəˌplʌg/
KK: /ˈɪrˌplʌg/
A small device made of soft material that is placed in the ear to block sound or water.
She wore earplugs to sleep in the noisy hotel room.
Earplug → It is formed from "ear" (from Old English "eare", meaning the organ of hearing) and "plug" (from Middle English "ploggen", meaning to stop or fill). The word "earplug" refers to an object used to stop or fill the ear to block out sound.
Think of an object that 'fills' ('plug') the 'organ of hearing' ('ear') to block out noise.
No commonly confused words.