What term is used for a line that includes several words that begin with the same letter?
Keep in mind that the words need to be either next to or quite close to each other. So this works:
Aunt Agatha ate all the apples. (The word "the" doesn't prevent "apples" from being part of the alliteration).
but this doesn't:
Aunt Gertrude ate most of a bag of apples in April.