Wave height descriptions

Hi - newbie question, sorry if it's been covered, I couldn't find it on the forum.
I have heard the heights of waves mentioned as overhead etc.
What are common wave heights and their descriptions/names, and how do you tell how big a wave is when you are in the water?
I was in surf that seemed about 4ft from top to bottom, would that be the measurement to quote or is it measured relative to something else?
Thanks!
I have heard the heights of waves mentioned as overhead etc.
What are common wave heights and their descriptions/names, and how do you tell how big a wave is when you are in the water?
I was in surf that seemed about 4ft from top to bottom, would that be the measurement to quote or is it measured relative to something else?
Thanks!