fraternise vs fraternize

fraternise and fraternize both are verbs.

Word	Noun	Adjective	Verb	Adverb
fraternise	No	No	Yes	No
fraternize	No	No	Yes	No

As verbs, fraternise and fraternize are synonyms defined as:

fraternise and fraternize: be on friendly terms with someone, as if with a brother, especially with an enemy

fraternise (verb)	fraternize (verb)
be on friendly terms with someone, as if with a brother, especially with an enemy	be on friendly terms with someone, as if with a brother, especially with an enemy