Hi centaurus,
Low speed stall: loss of lift due to high angle of attack
High speed stall: loss of lift due to shockwaves, sometimes also called shock stall
As altitude increases low speed stall & high speed stall become closer to each other, till the point where they are the same speed = coffin corner.
Stalling in relatively high speed due to turning or pulling up (g-force) is still a "low speed stall", because the angle of attack is the cause.
See also:
SKYbrary - Aerodynamic Stall Awareness and Avoidance