An alliteration is a poem or sentence in which almost all of the words start with the same letter.
Example:
Peter Piper picked a peck of pickled peppers.
If Peter Piper picked a peck of pickled peppers, where's the peck of pickled peppers that Peter Piper picked?
Dirty dolphins die in the dirt
Cool cats cook cookies
Four fishes fly frozen
Shainy snails go speedly
Hungry horses hide in a house
Parrots pull a panda
Colorfull cats crawl
Many monkeys makes movies
Green gepard give me a game
Wonderfull whales writing in the water