soberness vs sincerity

soberness and sincerity both are nouns.

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

As nouns, sincerity is a hypernym of soberness; that is, sincerity is a word with a broader meaning than soberness:

Other hypernyms of soberness include earnestness, serious-mindedness, seriousness.

soberness (noun)	sincerity (noun)
a manner that is serious and solemn	the quality of being open and truthful; not deceitful or hypocritical
the state of being sober and not intoxicated by alcohol	the trait of being serious
	a quality of naturalness and simplicity
	an earnest and sincere feeling