The poem is all about the qualities of a best friend. A best friend is like an angel sent by God to be with you all the times of your life. A best friend is a true friend who stay with you through all your ups and downs of your life. Such friend is indeed a best friend.
the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.
Consonance-agreement or compatibility between opinions or actions.
"consonance between conservation measures and existing agricultural practice"
synonyms: agreement, accord, harmony, unison; More
the recurrence of similar sounds, especially consonants, in close proximity (chiefly as used in prosody).
the combination of notes that are in harmony with each other due to the relationship between their frequencies.
plural noun: consonances
in poetry, the repetition of the sound of a vowel or diphthong in nonrhyming stressed syllables near enough to each other for the echo to be discernible (e.g., penitence, reticence ).