Foam is usually harmless. In fact, only 1 percent of the foam you see on a waterbody is the actual foaming agent; the rest is air and water. However, excess foam is sometimes the result of too much phosphorus in the water. Although phosphorus in an important plant nutrient, it is not found abundantly in nature and too much of it is indicative of pollution from human activities.
A confection is a food loaded with sugar. Chocolate layer cake, strawberry lollipops, and vanilla bonbons are all confections.
The word confectioner means someone who makes candies and other sweets, thus confectioners' sugar is widely used in candy making and baking. Confectioners' sugar is not the same as superfine sugar or bakers' sugar. These products are finer than granulated sugar, but not as fine as confectioners' sugar.