manna from heaven vs windfall

manna from heaven and windfall both are nouns.

Word	Noun	Adjective	Verb	Adverb
manna from heaven	Yes	No	No	No
windfall	Yes	No	No	No

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

manna from heaven and windfall: 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, gold rush, gravy.

manna from heaven (noun)	windfall (noun)
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	fruit that has fallen from the tree