sobriety vs soberness

sobriety and soberness both are nouns.

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

As nouns, sobriety and soberness are synonyms defined as:

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

As nouns, sobriety and soberness are synonyms defined as:

sobriety and soberness: the state of being sober and not intoxicated by alcohol

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