dichotomy vs categorization

dichotomy and categorization both are nouns.

Word	Noun	Adjective	Verb	Adverb
dichotomy	Yes	No	No	No
categorization	Yes	No	No	No

As nouns, categorization is a hypernym of dichotomy; that is, categorization is a word with a broader meaning than dichotomy:

dichotomy: being twofold; a classification into two opposed parts or subclasses
categorization: a group of people or things arranged by class or category

Other hypernyms of dichotomy include categorisation, classification.

dichotomy (noun)	categorization (noun)
being twofold; a classification into two opposed parts or subclasses	the act of distributing things into classes or categories of the same type
	the basic cognitive process of arranging into classes or categories
	a group of people or things arranged by class or category