In a paragraph define the words alliteration and repetition and onomatopoeia and provide an example of each then explain how poets use the sound devices to enhance mood and meaning in their poems support your answer with evidence

Alliteration is the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.  Repetition repeats the same words or phrases a few times to make the statement clear to the reader. Onomatopoeia is the use of imitative and naturally suggestive words for a dramatic effect.
Poets traditionally use alliteration to make a a constant sound and rhythm mostly used to make a lighter mood.  Repetition is used almost everywhere is commercials, song lyrics, and religious chants. Repetition is used by poets to emphasize a feeling or an idea, create rhythm, or develop a sense of urgency.  Onomatopoeia is primarily used to describe sounds the author has a hard time describing in more words. 
Alliteration-
"Finley the flat, floppy fish 
Furiously flying through water 
Fearlessly following friends
Ferreting for food
Fin flying fast
Fascinating about fish fingers."
- Unknown
Repetition-
"If you have to dry the dishes
(Such an awful, boring chore)
If you have to dry the dishes
('Stead of going to the store)
If you have to dry the dishes
And you dropped one on the floor-
Maybe they won't let you
Dry the dishes anymore." 
-Shel Silverstein 
Onomatopoeia-
"Bright streaks wiz through
the sky.
Thunk! Woosh!
Brightly colored explosions
sizzle and pop, pop, pop."
-Unknown