1. (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money)

• bonanza
• boom
• bunce
• godsend
• gravy
• manna from heaven
• windfall

1. (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money)

• happening
• natural event
• occurrence
• occurrent

2. (noun) a large migration of people to a newly discovered gold field

• migration