re-sentencing vs mercifulness

re-sentencing and mercifulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
re-sentencing	Yes	No	No	No
mercifulness	Yes	No	No	No

As nouns, mercifulness is a hypernym of re-sentencing; that is, mercifulness is a word with a broader meaning than re-sentencing:

re-sentencing: (law) the reduction in severity of a punishment imposed by law
mercifulness: leniency and compassion shown toward offenders by a person or agency charged with administering justice

Other hypernyms of re-sentencing include clemency, mercy.

re-sentencing (noun)	mercifulness (noun)
(law) the reduction in severity of a punishment imposed by law	leniency and compassion shown toward offenders by a person or agency charged with administering justice
	a disposition to be kind and forgiving
	the feeling that motivates compassion