sanguineness vs sanguinity

sanguineness and sanguinity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sanguineness	Yes	No	No	No
sanguinity	Yes	No	No	No

As nouns, sanguineness and sanguinity are synonyms defined as:

sanguineness and sanguinity: feeling sanguine; optimistically cheerful and confident

sanguineness (noun)	sanguinity (noun)
feeling sanguine; optimistically cheerful and confident	feeling sanguine; optimistically cheerful and confident