oligarch

noun3

1. •
   A member of an oligarchy; someone who is part of a small group that runs a country.
2. •
   A very wealthy business owner who wields political power.

   • Millions of people were starving, while the oligarchs and their supporters were surfeiting on the surplus. — 1908
3. •
   A protoplanet formed during oligarchic accretion.