dichotomisation vs dichotomization

dichotomisation and dichotomization both are nouns.

Word	Noun	Adjective	Verb	Adverb
dichotomisation	Yes	No	No	No
dichotomization	Yes	No	No	No

As nouns, dichotomisation and dichotomization are synonyms defined as:

dichotomisation and dichotomization: the act of dividing into two sharply different categories

dichotomisation (noun)	dichotomization (noun)
the act of dividing into two sharply different categories	the act of dividing into two sharply different categories