ALLITERATION is used as a literary device in the poem.

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The poem consists of several literary devices.They are listed bellow

Simile means direct comparison with the words "like" or "as"
Example:On the river like a humped bull

Personification is where a non-living thing is compared to living thing.
Example:But the marble flame
In this poem the marble being a motionless thing is compared to a flame that fires.

Metophor is a indirect comparison without using any words such as "like" or "As".
It is also termed as hidden comparision
Example:Earth's other moon

4. Anticlimax
It indicates sudden sorrow.
Example:how its rubs expensive delicate salt in the wound of un requited love!It indicates the fear and sorrow and change of mood

It is used to denote the words with same starting letter.