Alliteration is the repetition of initial constant sounds of nearby words. It is a literary sound device used for emphasis and effect.
Alliteration only occurs when consonant (not vowel) sounds are repeated in words close to each other. These words may be within the same phrase, clause, or sentence, or they may occur on successive lines (as in poetry or lyrics).
Tongue twisters are a well - known use of alliteration. Alliteration draws attention to the phrase and is often used for emphasis.
1) Only the repetition of the same sound is valid in an alliteration not the consonants themselves.
Example:
That’s the first photo of France from the Moon.
A neat knot need not be re - knotted.
The girl grabbed the golden goose and ran.
Although the above examples start with different consonants, they make perfect examples of alliteration.
2) In contrary, if a neighboring word starts with the same consonant but have a different initial sound, then it is not alliteration.
Example:
colored carpet, deepest dam
Since, they have different sounds, they cannot be classified as alliteration.