This poem is famous for its use of internal rhyme and refrain, creating a haunting and repetitive effect. Every line ends with the same word or a word that rhymes with it.
For example, the first stanza goes:
> Once upon a midnight dreary, while I pondered, weak and weary,
> Over many a quaint and curious volume of forgotten lore—
> When the nights were long and cold, and the days were short and old,
> And the fire burned low and slow, and the wind blew high and bold,
> And the rain beat down upon the pane, and the snow fell soft and low,
> And the raven sat upon the bust of Pallas just above my door—
> Then this ebony bird beguiling my sad fancy into smiling,
> By the grave and stern decorum of the countenance it wore,
> "Though" I said, "’tis a story sad, ’tis a story true,"
> I know of no mortal raven who could ever tell me true—
> "Tell me, then, I prithee, raven, tell me true,"
> I saw a shadow falling on the wall beside the door—
> And my soul from out that shadow that lies floating on the floor
> Shall be lifted—nevermore!
Notice how the lines end with: *dreary, weary, lore, old, bold, low, door, smiling, wore, true, true, true, door, floor, nevermore!*
While the poem may not have *exact* echoing words, it does have closely rhyming words for each line, creating a strong sense of rhythm and repetition.