constant of gravitation vs gravitational constant

constant of gravitation and gravitational constant both are nouns.

Word	Noun	Adjective	Verb	Adverb
constant of gravitation	Yes	No	No	No
gravitational constant	Yes	No	No	No

As nouns, constant of gravitation and gravitational constant are synonyms defined as:

constant of gravitation and gravitational constant: (physics) the universal constant relating force to mass and distance in Newton's law of gravitation

Other synonyms of constant of gravitation include G, universal gravitational constant.

constant of gravitation (noun)	gravitational constant (noun)
(physics) the universal constant relating force to mass and distance in Newton's law of gravitation	(physics) the universal constant relating force to mass and distance in Newton's law of gravitation