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Bonanza
Positive Connotation
The word 'bonanza' often implies a happy surprise or fortunate event, usually involving wealth or success. 
Figurative Use
'Bonanza' can be used figuratively to describe an abundance of non-material things, like love or opportunities. 
Contemporary Usage
Today, 'bonanza' has a broader meaning and is not limited to wealth, often indicating a good amount of anything. 