Potential answers for "They whistle while they work"

⭐⭐⭐⭐ KETTLES
⭐⭐⭐⭐ REFS
⭐⭐⭐ AUTOMATA
⭐⭐⭐ RNS
⭐⭐⭐ SAWS
⭐⭐⭐ AVIATORS
⭐⭐⭐ WASHERS
⭐⭐⭐ CREWS

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