socializing vs coming together

socializing and coming together both are nouns.

Word	Noun	Adjective	Verb	Adverb
socializing	Yes	No	No	No
coming together	Yes	No	No	No

As nouns, coming together is a hypernym of socializing; that is, coming together is a word with a broader meaning than socializing:

Other hypernyms of socializing include congress, meeting.

socializing (noun)	coming together (noun)
the act of meeting for social purposes	the social act of assembling for some common purpose
	the act of joining together as one