itemise vs item

itemise is not a noun while item is a noun.

Word	Noun	Adjective	Verb	Adverb
itemise	No	No	Yes	No
item	Yes	No	No	Yes

itemise (noun)	item (noun)
	a whole individual unit; especially when included in a list or collection
	an isolated fact that is considered separately from the whole
	a distinct part that can be specified separately in a group of things that could be enumerated on a list
	an individual instance of a type of symbol
	a small part that can be considered separately from the whole

itemise (verb)	item (verb)
specify individually
place on a list of items

itemise (adverb)	item (adverb)
	(used when listing or enumerating items) also