The poet's uses word choice reinforce the mood of the piece by:
The constant repetition of the word makes stronger the effect and the essentiality of the statement..
Note that the repetition of "nevermore" retell or show the grief, despair and hopelessness faced by the speaker in the poem.
The tone of "The Raven" is said to be a desperate note , as the speaker was said to have turns to a raven for comfort while its mood is eerie.
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