Synonyms of bonanza
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jackpotA jackpot is the most valuable prize in a game or lottery, especially when the game involves increasing the value of the prize until someone wins it.
• the biggest ever jackpot of more than £5 million
windfallA windfall is a sum of money that you receive unexpectedly or by luck, for example if you win a lottery.
• If you had a windfall of £5000, how would you spend it?
Thesaurus for bonanza from the Collins English Thesaurus