Potential answers for "Sounds of well-tuned engines"

⭐⭐⭐⭐ HUMS
⭐⭐⭐ ENGINEPURR
⭐⭐⭐ ACUTE
⭐⭐⭐ PURRS
⭐⭐⭐ ONADIME
⭐⭐⭐ PURR
⭐⭐⭐ HUM

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