pinnacle
/ˈpɪnəkəl/
noun
Meaning
The highest point.
A tall, sharp and craggy rock or mountain.
An all-time high; a point of greatest achievement or success.
An upright member, generally ending in a small spire, used to finish a buttress, to constitute a part in a proportion, as where pinnacles flank a gable or spire.
verb
Meaning
To put something on a pinnacle.
To build or furnish with a pinnacle or pinnacles.