graveness vs soberness

graveness and soberness both are nouns.

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

As nouns, graveness and soberness are synonyms defined as:

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

graveness (noun)	soberness (noun)
a manner that is serious and solemn	a manner that is serious and solemn
	the state of being sober and not intoxicated by alcohol