Final answer:
The most notable sound device in this excerpt is assonance.
Step-by-step explanation:
The most notable sound device in this excerpt from "Sea Fever" by John Masefield is assonance. Assonance refers to the repetition of vowel sounds within words or phrases. In this poem, the repetitive use of the long 'e' sound in words like 'sleep' and 'sweet' creates a musical quality and adds to the overall rhythm and flow of the poem.
Learn more about sound devices in poetry