A combination starter usually applies to Motors.
It is a Motor Starter that has some sort of motor protection within its circuitry, i.e. fuses, or circuit breakers.
They typically contain Fuses, or Circuit Breakers, contactors, motor protection (in the form of Overload Heater-similar to circuit breakers, but may specifically for devices that draw a lot of current for a brief period).
Combo starters may also feature Forward or reverse starting configurations, and push buttons for On/Off Control.
Combo starters can be contained in a single enclosure, and combo starters can usually be found within MCCs (Motor Control Centers).
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A DOL or direct on line starter works by connecting the motor terminals directly to the power supply when they are energized. A DOL starter is the simplest type of motor starter.
I think one is conventional starter motors and the other is Gear-reduction starter motor.
DOL, Star Delta, Soft starter, VFD
Across the line starter has a large inrush current.
A three point starter is a device that is meant to help start a DC motor. A three point starter will start device without much starting current.