pinnacle

(noun): The highest point.
(noun): A tall, sharp and craggy rock or mountain.
(noun): An all-time high; a point of greatest achievement or success.
(noun): 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): To put something on a pinnacle.
(verb): To build or furnish with a pinnacle or pinnacles.