illustrate vs illustration

illustrate is not a noun while illustration is a noun.

Word	Noun	Adjective	Verb	Adverb
illustrate	No	No	Yes	No
illustration	Yes	No	No	No

illustrate (noun)	illustration (noun)
	a visual representation (a picture or diagram) that is used to make some subject more pleasing or easier to understand
	an item of information that is typical of a class or group
	artwork that helps make something clear or attractive
	showing by example

illustrate (verb)	illustration (verb)
clarify by giving an example of
depict with an illustration
supply with illustrations