event vs social event

event and social event both are nouns.

Word	Noun	Adjective	Verb	Adverb
event	Yes	No	No	No
social event	Yes	No	No	No

As nouns, social event is a hyponym of event; that is, social event is a word with a more specific, narrower meaning than event:

event (noun)	social event (noun)
something that happens at a given place and time	an event characteristic of persons forming groups
a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory
a phenomenon that follows and is caused by some previous phenomenon
a special set of circumstances