soberness vs sobriety

soberness and sobriety both are nouns.

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

As nouns, soberness and sobriety are synonyms defined as:

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

As nouns, soberness and sobriety are synonyms defined as:

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

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