Potential answers for "Oil industry honcho"

⭐⭐⭐⭐ BARON
⭐⭐⭐ PETRO
⭐⭐⭐ CZAR
⭐⭐⭐ BARONS
⭐⭐⭐ TULSA
⭐⭐⭐ OPEC
⭐⭐⭐ PETROCHEMISTRY

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