mildness vs softness

mildness and softness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mildness	Yes	No	No	No
softness	Yes	No	No	No

As nouns, mildness and softness are synonyms defined as:

mildness and softness: acting in a manner that is gentle and mild and even-tempered

Other synonyms of mildness include gentleness.

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

Other hyponyms of mildness include balminess.

mildness (noun)	softness (noun)
mercifulness as a consequence of being lenient or tolerant	the property of giving little resistance to pressure and being easily cut or molded
acting in a manner that is gentle and mild and even-tempered	a sound property that is free from loudness or stridency
good weather with comfortable temperatures	a disposition to be lenient in judging others
	acting in a manner that is gentle and mild and even-tempered
	the trait of being effeminate (derogatory of a man)
	the quality of being indistinct and without sharp outlines
	a visual property that is subdued and free from brilliance or glare
	a state of declining economic condition
	poor physical condition; being out of shape or out of condition (as from a life of ease and luxury)
	the quality of weather that is deliciously mild and soothing