Compounding:
In linguistics, compounding refers to the process of joining two or more morphemes (meaningful units) to create a new word with a new meaning.
Example breakdown:
"School bus" combines the morphemes "school" and "bus" to create a single word that describes a vehicle used to transport students to school.
Other examples of compounding:
"raincoat, "sunflower, "keyboard, and "toothbrush.