Potential answers for "Notable feature of an echo chamber"

⭐⭐⭐⭐ ACOUSTICS
⭐⭐⭐ CAVERN
⭐⭐⭐ ALEXA
⭐⭐ JAW
⭐⭐ NECK
⭐⭐ SQUAREJAW
⭐⭐ TIDE
⭐⭐ HAIR
⭐⭐ HERA
⭐⭐ BALDNESS

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