Here's why:
* Literary devices are techniques used by writers to create a particular effect or to enhance their writing.
* Figures of speech are a type of literary device that uses language in a non-literal way to create an image, emphasize a point, or evoke an emotion. Examples include metaphors, similes, personification, and hyperbole.
* Exaggeration is a specific type of figure of speech called hyperbole. It intentionally overstates something for emphasis or humor.
So, both figures of speech and exaggerations are considered literary devices because they are techniques used to enhance writing.