Recently I have seen an influx of topics regarding worst flight experiences etc on the forum (like this one) and thought it would be a good idea to educate the forum on how to report turbulence and chop and the difference in them.
Turbulence that causes slight, rapid and somewhat rhythmic bumpiness without appreciable changes in altitude or attitude.
Turbulence that momentarily causes slight, erratic changes in altitude and/or attitude (pitch, roll, yaw).
Turbulence that is similar to Light Chop but of greater intensity. It causes rapid bumps or jolts without appreciable change in aircraft or attitude.
Turbulence that is similar to Light Turbulence but of greater intensity. Changes in altitude and/or attitude occur but the aircraft remains in positive control at all times. It usually causes variation in indicated speed.
Turbulence that causes large, abrupt changes in altitude and/or attitude. It usually causes large variations in indicated airspeed. Aircraft may be momentarily out of control.
Turbulence in which the aircraft is violently tossed about and is practically impossible to control. It may causes structural damage.
if you want to read about how things react inside the aircraft or how often it is reported as well as this information I posted, you can view the source here