graveness vs sobriety

graveness and sobriety both are nouns.

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

As nouns, graveness and sobriety are synonyms defined as:

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

graveness (noun)	sobriety (noun)
a manner that is serious and solemn	abstaining from excess
	a manner that is serious and solemn
	moderation in or abstinence from alcohol or other drugs
	the state of being sober and not intoxicated by alcohol