pin·na·cle 
/ˈpɪnɪkəl/ noun
plural pin·na·cles /ˈpɪnɪkəl/ noun [count] 1 : a high mountain top
▪ a lofty pinnacle 2 : the best or most important part of something : the point of greatest success or achievement — usually singular ▪ His career reached its pinnacle when he won the championship. — often + of ▪ Winning the championship was the pinnacle of his career. ▪ She stands at the pinnacle of the fashion industry. ▪ She has achieved/reached the pinnacle of success. 3 : a tower on the roof of a building that comes to a narrow point at the top
▪ a lofty pinnacle
