acute vs acuteness

acute and acuteness both are nouns.

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

acute (noun)	acuteness (noun)
a mark placed above a vowel to indicate pronunciation	the quality of having a sharp edge or point
	a quick and penetrating intelligence
	a sensitivity that is keen and highly developed

acute (adjective)	acuteness (adjective)
having or experiencing a rapid onset and short but severe course
of an angle; less than 90 degrees
of critical importance and consequence
having or demonstrating ability to recognize or draw fine distinctions
ending in a sharp point
extremely sharp or severe