mercy vs humaneness

mercy and humaneness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mercy	Yes	No	No	No
humaneness	Yes	No	No	No

As nouns, humaneness is a hypernym of mercy; that is, humaneness is a word with a broader meaning than mercy:

mercy: a disposition to be kind and forgiving
humaneness: the quality of compassion or consideration for others (people or animals)

mercy (noun)	humaneness (noun)
leniency and compassion shown toward offenders by a person or agency charged with administering justice	the quality of compassion or consideration for others (people or animals)
alleviation of distress; showing great kindness toward the distressed
a disposition to be kind and forgiving
the feeling that motivates compassion
something for which to be thankful