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Write the difference between:

a. Gravitational constant (G) and acceleration due to gravity (g).
b. Gravity and Gravitation force.
c. Gravity and acceleration due to gravity.
d. Mass and weight.
e. Freefall and weightlessness.

a. Gravitational constant (G) and acceleration due to gravity (g)

Gg
It is the force of attraction between 2 bodies of mass 1 kg each kept at the distance of 1m between their centers.It is the acceleration produced on freely falling bodies due to the influence of gravity.
It is a constant value.It is a variable value.
Its unit is Nm2/kg2.Its unit is m/s2.

b. Gravity and gravitational force.

GravityGravitational force
It is the force of attraction by which any body is attracted toward the center of any heavenly body from its surface.It is the force of attraction by which the two different heavenly bodies are attracted to each other with a certain force.

c. Gravity and acceleration due to gravity.

GravityAcceleration due to gravity
It is the force of attraction by which any body is attracted toward the center of any heavenly body from its surface.
It the acceleration produced on a freely falling body due to the influence of gravity of any heavenly body.

d. Mass and weight.

MassWeight
The total amount of matter contained in any body is called mass.The gravity acting on any body of a certain mass is called weight.
It depends upon the size and number of atoms present in the body.It depends upon the mass and value of acceleration due to gravity.
Its SI unit is Kg.Its SI unit is Newton (N).

e. Freefall and Weightlessness.

FreefallWeightlessness
When a body is falling freely under the influence of gravity only, it is called freefall.It is the state of any body having zero weight.
It is one of the causes of weightlessness.It is one of the effects of freefall.