fraternisation vs fraternization

fraternisation and fraternization both are nouns.

Word	Noun	Adjective	Verb	Adverb
fraternisation	Yes	No	No	No
fraternization	Yes	No	No	No

As nouns, fraternisation and fraternization are synonyms defined as:

fraternisation and fraternization: associating with others in a brotherly or friendly way; especially with an enemy

fraternisation (noun)	fraternization (noun)
associating with others in a brotherly or friendly way; especially with an enemy	associating with others in a brotherly or friendly way; especially with an enemy