Potential answers for "Some who whistle while they work"

⭐⭐⭐⭐ REFS
⭐⭐⭐ AVIATORS
⭐⭐⭐ KETTLES
⭐⭐⭐ DWARF
⭐⭐⭐ DWARFS
⭐⭐ AUTOMATA
⭐⭐ RNS

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