earnestness vs earnest

earnestness and earnest both are nouns.

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

earnestness (noun)	earnest (noun)
the trait of being serious	something of value given by one person to another to bind a contract
an earnest and sincere feeling

earnestness (adjective)	earnest (adjective)
	not distracted by anything unrelated to the goal
	characterized by a firm and humorless belief in the validity of your opinions
	sincerely earnest