classification vs categorisation

classification and categorisation both are nouns.

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

As nouns, classification and categorisation are synonyms defined as:

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

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

As nouns, classification and categorisation are synonyms defined as:

classification and categorisation: the basic cognitive process of arranging into classes or categories

Other synonyms of classification include categorization, sorting.

As nouns, classification and categorisation are synonyms defined as:

classification and categorisation: a group of people or things arranged by class or category

Other synonyms of classification include categorization.

classification (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
restriction imposed by the government on documents or weapons that are available only to certain authorized people	the basic cognitive process of arranging into classes or categories
the basic cognitive process of arranging into classes or categories	a group of people or things arranged by class or category
a group of people or things arranged by class or category