law of gravitation vs G

law of gravitation and G both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of gravitation	Yes	No	No	No
G	Yes	No	No	No

law of gravitation (noun)	G (noun)
(physics) the law that states any two bodies attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them	the 7th letter of the Roman alphabet
	the cardinal number that is the product of 10 and 100
	a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
	a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes
	(physics) the universal constant relating force to mass and distance in Newton's law of gravitation
	one of the four nucleotides used in building DNA, also known as deoxyguanylate, or dGMP; all four nucleotides have a common phosphate group and a sugar (ribose)
	a purine base found in DNA and RNA; pairs with cytosine