I supposed I was thinking of trade associations (like the NFL) when I said not all non-profits are charities. Now that I say that though I wonder if there is a

I supposed I was thinking of trade associations (like the NFL) when I said not all non-profits are charities. Now that I say that though I wonder if there is a legal difference between the terms "non-profit" and "not for profit" and if one of those applies more appropriately to trade associations.