competition vs social event

competition and social event both are nouns.

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

As nouns, social event is a hypernym of competition; that is, social event is a word with a broader meaning than competition:

competition: an occasion on which a winner is selected from among two or more contestants
social event: an event characteristic of persons forming groups

competition (noun)	social event (noun)
the act of competing as for profit or a prize	an event characteristic of persons forming groups
an occasion on which a winner is selected from among two or more contestants
the contestant you hope to defeat
a business relation in which two parties compete to gain customers