Opportunity profits vs. opportunity costs
Opportunity cost is simply the value not obtained of the highest value alternative. It can be positive or negative; meaning it doesn't really make sense to define the opposite as opportunity profit. There is only two ways to go about it rationally, either you are profiting from doing something, or you are not profiting by not doing something, which is defined as opportunity cost. Opportunity profit would just equate to opportunity cost because you are not doing whatever the opportunity is. (Also, I'm not the down voter).