bonanza vs windfall

bonanza and windfall both are nouns.

Word	Noun	Adjective	Verb	Adverb
bonanza	Yes	No	No	No
windfall	Yes	No	No	No

As nouns, bonanza and windfall are synonyms defined as:

bonanza and windfall: a sudden happening that brings good fortune (as a sudden opportunity to make money)

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

bonanza (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)
an especially rich vein of precious ore	fruit that has fallen from the tree