socialise vs fraternise

socialise and fraternise both are verbs.

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

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

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

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

socialise (verb)	fraternise (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