acuity vs keenness

acuity and keenness both are nouns.

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

As nouns, acuity and keenness are synonyms defined as:

Other synonyms of acuity include acuteness, sharpness.

acuity (noun)	keenness (noun)
a quick and penetrating intelligence	thinness of edge or fineness of point
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)	a quick and penetrating intelligence
	a positive feeling of wanting to push ahead with something