Here's how it works:
* Spoon: The base word refers to a utensil used for eating.
* -ful: The suffix adds the idea of being filled or containing something.
Therefore, "spoonful" means "the amount that a spoon can hold".
We can apply the same logic to other words with the "-ful" suffix:
* Handful: A quantity that fits in the hand.
* Cupful: The amount that a cup can hold.
* Basketful: The amount that a basket can hold.
The suffix "-ful" provides a clear and consistent way to understand the meaning of these words.