event vs natural event

event and natural event both are nouns.

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

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

event (noun)	natural event (noun)
something that happens at a given place and time	an event that happens
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