stodginess vs soberness

stodginess and soberness both are nouns.

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

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

Other hypernyms of stodginess include graveness, gravity, sobriety, somberness, sombreness.

stodginess (noun)	soberness (noun)
dull and pompous gravity	a manner that is serious and solemn
	the state of being sober and not intoxicated by alcohol