What's the difference in pronunciation between mother and mutter? (US English)

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Answer

I agree with the others.  Some more examples:

Mother rhymes with other, brother.

Mutter rhymes with butter.

In some dialects/accents they might be pronounced the same, but not usually.

Answer

Mostly the consonants. Mother has the TH sound and Mutter the TT. The vowels are slightly different as well but quite similar.

Answer

There’s a difference in pronunciation between them.
mother_ /'mʌðər/
mutter_ /ˈmʌtər/