event vs abstract entity

event and abstract entity both are nouns.

Word	Noun	Adjective	Verb	Adverb
event	Yes	No	No	No
abstract entity	Yes	No	No	No

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

event: something that happens at a given place and time
abstract entity: a general concept formed by extracting common features from specific examples

Other hypernyms of event include abstraction.

event (noun)	abstract entity (noun)
something that happens at a given place and time	a general concept formed by extracting common features from specific examples
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