What is the vertical distance between the trough and crest of a wave called?

Answer 1

The vertical distance between trough and crest is called the height of the wave. While the crest is the highest point of a wave, the trough is the lowest point.
Are you talking about waves? That simply depends on the frequency of the wave; crest and trough are just terms given to sections of waves. The crest is the top of the wave, and the trough is the bottom.

It's the amplitude. Like on the drawn parts of a transverse wave. You can look it up on Google images.
wave hight

Answer 2

The vertical distance between a crest and trough is the peak to peak amplitude of a wave. In comparison, the vertical distance from a midpoint to a crest or a trough is called the peak amplitude.

Answer 3

The vertical distance between the trough and crest of a wave is called the peak-to-peak amplitude. Half of that distance is called the wave's peak amplitude.