Potential answers for "Visible proof of hard work"

⭐⭐⭐⭐ CALLUSES
⭐⭐ SLOG
⭐⭐ EARN
⭐⭐ OVERDO
⭐⭐ SLAVE
⭐⭐ GRINDSTONE
⭐⭐ HUSTLE
⭐⭐ TOIL
⭐⭐ MOIL

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