dehumanisation vs dehumanization

dehumanisation and dehumanization both are nouns.

Word	Noun	Adjective	Verb	Adverb
dehumanisation	Yes	No	No	No
dehumanization	Yes	No	No	No

As nouns, dehumanisation and dehumanization are synonyms defined as:

dehumanisation and dehumanization: the act of degrading people with respect to their best qualities

dehumanisation (noun)	dehumanization (noun)
the act of degrading people with respect to their best qualities	the act of degrading people with respect to their best qualities