IPA: /ˈɪəˌmʌf/
KK: /ˈɪrˌmʌf/
A type of covering for the ears that is usually connected by a band and is used to keep the ears warm or to block out noise.
She wore earmuffs to keep her ears warm during the winter.
Earmuff → It is formed from "ear" (from Old English "eare", meaning the organ of hearing) and "muff" (from Middle English "mof", meaning a tubular covering for the hands or ears). The word "earmuff" refers to a covering designed to protect the ears from cold or noise.
Think of a 'covering' ('muff') for your 'ears' — that's what earmuffs are designed to do.
No commonly confused words.