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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.
POETIC DEVICE :- The repetition of consonant sounds, especially at the beginning of words. Example: “Fetched fresh, as I suppose, off some sweet wood.”

example: “We have always remained loyal to the crown.”