MY VOCAB PRACTICE:
Potent
He's a potent man even if what he's been through is a madness.Impotent
After he lost his entire family into a car accident, he became an impotent man with no hope in life.Potential
Even if they had not too many things in common, he became a potential boyfriend in the near future.Potentate
The price of UK was the first potentate of his country, and came nearer than any other prince could.
Good work!