"Apex" vs. "culmination": words at the top

What is similar?
Both "apex" and "culmination" refer to the highest point or peak of something, often representing a climax or the most successful point in a process or series.
What is different?
"Apex" is often used more literally or physically to describe a peak or topmost point, such as the apex of a mountain. "Culmination" usually refers to the highest or most decisive point in a process, event, or period, emphasizing the result of development or effort rather than a physical peak.
Which one is more common?

Examples of usage
Apex- The apex of the mountain was covered in snow.
- Winning the gold medal was the apex of her athletic career.
- At the apex of the triangle, a star was drawn.
- The concert was the culmination of months of planning.
- His promotion was the culmination of years of hard work.
- The movie reached its culmination with an unexpected twist.