gold rush vs manna from heaven

gold rush and manna from heaven both are nouns.

Word	Noun	Adjective	Verb	Adverb
gold rush	Yes	No	No	No
manna from heaven	Yes	No	No	No

As nouns, gold rush and manna from heaven are synonyms defined as:

gold rush and manna from heaven: a sudden happening that brings good fortune (as a sudden opportunity to make money)

Other synonyms of gold rush include bonanza, boom, bunce, godsend, gravy, windfall.

gold rush (noun)	manna from heaven (noun)
a large migration of people to a newly discovered gold field	a sudden happening that brings good fortune (as a sudden opportunity to make money)
a sudden happening that brings good fortune (as a sudden opportunity to make money)	(Old Testament) food that God gave the Israelites during the Exodus