graveness vs gravity

graveness and gravity both are nouns.

Word	Noun	Adjective	Verb	Adverb
graveness	Yes	No	No	No
gravity	Yes	No	No	No

As nouns, graveness and gravity are synonyms defined as:

Other synonyms of graveness include soberness, sobriety, somberness, sombreness.

graveness (noun)	gravity (noun)
a manner that is serious and solemn	a manner that is serious and solemn
	a solemn and dignified feeling
	(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface