assortment vs categorisation

assortment and categorisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
assortment	Yes	No	No	No
categorisation	Yes	No	No	No

As nouns, assortment and categorisation are synonyms defined as:

assortment and categorisation: the act of distributing things into classes or categories of the same type

Other synonyms of assortment include categorization, classification, compartmentalisation, compartmentalization.

assortment (noun)	categorisation (noun)
the act of distributing things into classes or categories of the same type	the act of distributing things into classes or categories of the same type
a collection containing a variety of sorts of things	the basic cognitive process of arranging into classes or categories
	a group of people or things arranged by class or category