otherization 

The implementation of an ‘us and them’ dichotomy that allows one group of humans to dehumanize another.

Every single member of this classist and ethnocentric Trump administration has mastered their own otherization narrative which when taken together clearly parallels Hitler’s Final Solution.

otherization by Dr Bunnygirl July 21, 2019

otherisation 

Used by the neuroscientist Kathleen Taylor to describe what happens when people are not included in their tribe; the others are commonly classed as beasts or subhumans.

Can be broadened towards separating people belonging to different religions or separating believers/non-believers, friends/not-friends

Those who carried out the final solution in Nazi Germany could only have done it by otherisation of the Jews.

otherisation by aaarwin October 28, 2012

cross overization

Cross-overization,
a noun form of "cross over", which can already be used as a noun

Zhang just made a cross overization on Yang.

cross overization by jackzhang August 13, 2008