incurvate vs incurvation

incurvate is not a noun while incurvation is a noun.

Word	Noun	Adjective	Verb	Adverb
incurvate	No	Yes	Yes	No
incurvation	Yes	No	No	No

incurvate (noun)	incurvation (noun)
	the action of creating a curved shape
	a shape that curves or bends inward

incurvate (adjective)	incurvation (adjective)
bent into or having an inward curve

incurvate (verb)	incurvation (verb)
cause to curve inward
bend inwards