mercifulness vs pity

mercifulness and pity both are nouns.

Word	Noun	Adjective	Verb	Adverb
mercifulness	Yes	No	No	No
pity	Yes	No	Yes	No

As nouns, pity is a hyponym of mercifulness; that is, pity is a word with a more specific, narrower meaning than mercifulness:

mercifulness: a disposition to be kind and forgiving
pity: the humane quality of understanding the suffering of others and wanting to do something about it

Other hyponyms of mercifulness include compassion, forgivingness, kindness, lenience, leniency, lenity, mildness.

mercifulness (noun)	pity (noun)
leniency and compassion shown toward offenders by a person or agency charged with administering justice	the humane quality of understanding the suffering of others and wanting to do something about it
a disposition to be kind and forgiving	an unfortunate development
the feeling that motivates compassion	a feeling of sympathy and sorrow for the misfortunes of others

mercifulness (verb)	pity (verb)
	share the suffering of