Poetic devices are tools that a poet can use to create rhythm, enhance a poem's meaning, or intensify a mood or feeling. It may be in the rhythm, topic, meaning, mood, and so on.
Examples : Hyperbole, Onemaetopia
Hyperbola is the use of exaggeration as a rhetorical device or figure of speech.
Onemaetopia is where a word like "Buzz" or "Bang" is used to describe a sound.