n.
coup
Meaning: a brilliant, unexpected act 2. the overthrow of a government and assumption of authority
Usage 1: Securing the rare interview was a major coup for the student newspaper.
Usage 2: The statesman thought his coup had succeeded, but the incumbent minister remained in power.
n.
prowess
Meaning: extraordinary ability
Usage: The musician had never taken a guitar lesson in his life, making his prowess with the instrument even more incredible.
adj.
redoubtable
Meaning: formidable 2. commanding respect
Usage: The audience greeted the redoubtable speaker with a standing ovation.