acuteness vs acuity

acuteness and acuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
acuteness	Yes	No	No	No
acuity	Yes	No	No	No

As nouns, acuteness and acuity are synonyms defined as:

Other synonyms of acuteness include keenness, sharpness.

acuteness (noun)	acuity (noun)
the quality of having a sharp edge or point	a quick and penetrating intelligence
a quick and penetrating intelligence	sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
a sensitivity that is keen and highly developed