sobriety vs graveness

sobriety and graveness both are nouns.

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

As nouns, sobriety and graveness are synonyms defined as:

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

sobriety (noun)	graveness (noun)
abstaining from excess	a manner that is serious and solemn
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