As adjectives the difference between additive and topping
is that
additive is pertaining to addition; that can be, or has been, added while
topping is wonderful.
As nouns the difference between additive and topping
is that
additive is a substance added to another substance or product for its ability to alter its properties while
topping is any food item added on top of another, such as sprinkles on ice cream or pepperoni on pizza.
As a verb topping is
present participle of lang=en.