Potential answers for "Twice-heard sound"

⭐⭐⭐⭐ ECHO
⭐⭐⭐ HARDG
⭐⭐⭐ SOFTG
⭐⭐⭐ LONGI
⭐⭐⭐ SCHWA
⭐⭐⭐ SPOUT
⭐⭐⭐ LONGO
⭐⭐⭐ LONGU

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