manna from heaven vs gold rush

manna from heaven and gold rush both are nouns.

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

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

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

Other synonyms of manna from heaven include bonanza, boom, bunce, godsend, gravy, windfall.

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