It is alliteration.
Assonance is the sequential repetition of vowel sounds, particularly in stressed syllables, as in the line “Full fathom five thy father lies,” in which “fathom” and “father” and “five” and “lies” have paralleled vowel sounds.
Consonance is the repetition of a pattern of consonants within words in which the separating vowels differ, as in the pairs “leaf” and “loaf” or “room” and “roam.”
Alliteration is the repetition of consonantal sounds in words close together, particularly using letters at the beginning of words or stressed syllables.
In a metaphor, a word is identified with something different from what the word literally denotes. A metaphor is distinguished from a simile in that it equates different things without using connecting terms such as like or as. Whereas a simile states, “My love is like a burning flame,” a metaphor refers to “the burning flame of my love.” An extended metaphor explores a variety of ways in which a metaphor is appropriate to its subject.
A very long answer to an easy question!! haha
Hope this helps.
Assonance – repetition of vowel sounds ( ‘i’ and ‘a’)