incision vs incisive

incision is a noun but incisive is not a noun.

Word	Noun	Adjective	Verb	Adverb
incision	Yes	No	No	No
incisive	No	Yes	No	No

incision (noun)	incisive (noun)
the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)
a depression scratched or carved into a surface

incision (adjective)	incisive (adjective)
	having or demonstrating ability to recognize or draw fine distinctions
	suitable for cutting or piercing