gravy vs natural event

gravy and natural event both are nouns.

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

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

gravy: a sudden happening that brings good fortune (as a sudden opportunity to make money)
natural event: an event that happens

Other hypernyms of gravy include happening, occurrence, occurrent.

gravy (noun)	natural event (noun)
a sudden happening that brings good fortune (as a sudden opportunity to make money)	an event that happens
the seasoned but not thickened juices that drip from cooking meats; often a little water is added
a sauce made by adding stock, flour, or other ingredients to the juice and fat that drips from cooking meats