mildness vs lenity

mildness and lenity both are nouns.

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

As nouns, mildness and lenity are synonyms defined as:

mildness and lenity: mercifulness as a consequence of being lenient or tolerant

Other synonyms of mildness include lenience, leniency.

mildness (noun)	lenity (noun)
mercifulness as a consequence of being lenient or tolerant	mercifulness as a consequence of being lenient or tolerant
acting in a manner that is gentle and mild and even-tempered
good weather with comfortable temperatures