acute vs perceptive

acute is a noun but perceptive is not a noun.

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

acute (noun)	perceptive (noun)
a mark placed above a vowel to indicate pronunciation

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