I said -
Radio Altimeter is 'more correct'. Radar comes from RAdio Detection And Ranging and a Rad Alt doesnt really detect anything. (Pedants stay away.)
The point of the discussion was - Radio Alt or Radar Alt. Every other ‘Radar’, Search, Fighter or Weather, needs to detect the direction and range of a target which may, or may not, be there.
Rad Alt doesn’t need to (first) detect anything to work, it bounces off something it knows is there - the earth. That’s the reason it’s Radio Alt rather than Radar Alt - and why I said - Pedants stay away.
