Potential answers for "It prevents knocks"

⭐⭐⭐⭐ OCTANE
⭐⭐ ESTOPS
⭐⭐ AVERTS
⭐⭐ DETERS
⭐⭐ STOPS
⭐⭐ HEADSOFF
⭐⭐ NIACIN
⭐⭐ RUST

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