Read the following excerpt from “the raven” by edgar allan poe and answer the question that follows.

deep into that darkness peering, long i stood there wondering, fearing,
doubting, dreaming dreams no mortals ever dared to dream before;
but the silence was unbroken, and the stillness gave no token,
and the only word there spoken was the whispered word, “lenore! ”
this i whispered, and an echo murmured back the word “lenore! ”
merely this and nothing more.

what literary device is used in the underlined words?