The word boom is an example of what type figure speech?

"Boom" can be an example of a few different figures of speech, depending on the context:

* Onomatopoeia: If "boom" is used to imitate the sound of an explosion or a loud noise, it's a clear example of onomatopoeia.

* Metaphor: "Boom" can be used metaphorically to describe a sudden and rapid increase or expansion, as in "The economy experienced a boom after the war."

* Hyperbole: If "boom" is used to exaggerate the loudness or impact of something, it can be considered hyperbole.

Ultimately, the specific figure of speech depends on how the word "boom" is used in a particular sentence or phrase.