Two stylistic devices that the poet uses in this poem are personification and repetition.

1. Personification: The poet personifies the snow by describing it as drifting into "hills of white." This adds interest and gives the snow a sense of movement and life, as if it has purpose or intention.

2. Repetition: The repetition of the line "The snow drifts into hills of white" at the beginning and end of the poem creates a sense of rhythm and symmetry. It also emphasizes the image of the snowdrifts, reinforcing their significance in relation to the themes of loneliness and lost love.

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The poet uses personification by giving the snow a sense of movement and life, as seen in the line "drifting into hills of white." Additionally, the repetition of this line at the beginning and end of the poem creates rhythm and emphasizes the snowdrifts' significance in relation to loneliness and lost love.