What term is used for the height of a mountain?
They are measured in either feet or meter's above the sea level, and the highest point is called the peak. The Total height is called the Altitude.
The cap height is a term used in typography. It is basically the line that shows how tall to make your capital letters. Cap height is the height from the baseline to the top of the uppercase letters in a font. It may or may not be the same as the height of the ascenders. Cap height is used in some systems to measure the type size.