socialise vs fraternize

socialise and fraternize both are verbs.

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

As verbs, fraternize is a hyponym of socialise; that is, fraternize is a word with a more specific, narrower meaning than socialise:

socialise: take part in social activities; interact with others
fraternize: be on friendly terms with someone, as if with a brother, especially with an enemy

Other hyponyms of socialise include get around, swing, fraternise, hobnob, entertain.

socialise (verb)	fraternize (verb)
make conform to socialist ideas and philosophies	be on friendly terms with someone, as if with a brother, especially with an enemy
prepare for social life
train for a social environment
take part in social activities; interact with others