graveness vs earnestness

graveness and earnestness both are nouns.

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

As nouns, earnestness is a hypernym of graveness; that is, earnestness is a word with a broader meaning than graveness:

Other hypernyms of graveness include serious-mindedness, seriousness, sincerity.

graveness (noun)	earnestness (noun)
a manner that is serious and solemn	the trait of being serious
	an earnest and sincere feeling