visualise vs visualisation

visualise is not a noun while visualisation is a noun.

Word	Noun	Adjective	Verb	Adverb
visualise	No	No	Yes	No
visualisation	Yes	No	No	No

visualise (noun)	visualisation (noun)
	a mental image that is similar to a visual perception

visualise (verb)	visualisation (verb)
make visible
imagine; conceive of; see in one's mind
form a mental picture of something that is invisible or abstract
view the outline of by means of an X-ray