windfall profit(n = noun.possession) - profit that occurs unexpectedly as a consequence of some event not controlled by those who profit from it;
is a kind of earnings, lucre, net, net income, net profit, profit, profits

gross profit, gross profit margin, margin of profit, net profit, paper profit, profit, profit and loss, profit and loss account, profit by, profit margin, profit sharing, profit taker, turn a profit, windfall