Just like in your home computer: here are the big-picture categories
-- CPU and memories powered, CPU clock running, kernel running, GNSS app running.
-- GNSS app stopped. Kernel running and consuming power.
-- Power applied, CPU clock stopped (IO, CPU and SRAM leakage current continues), RTC and BBRAM maintained.
-- Operating VCC and VCCIO removed (CPU and SRAM unpowered), but V_BCKP still supplied for RTC and BBRAM
-- All power removed.
This detail is available in bits and pieces in the documentation and command descriptions.
You should be able to match the appropriate names to these modes as Run, GNSS stopped, software backup, hardware backup, off.