windfall in WordNet English dictionary

1. a sudden happening that brings good fortune (as a sudden opportunity to make money)
   "the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
   boom  bonanza  gold rush  gravy  godsend  manna from heaven  windfall  bunce 
   
2. fruit that has fallen from the tree
   windfall