Onomatopoeia is a word that imitates the sound it represents. Watch this video using only onomatopoeia. How many examples do you see/hear?
A simile compares two unlike things by connecting them with the words "like" or "as". This music video will really help you identify the use of similes to compare two things.
A metaphor compares two unlike things without using the words "like" or "as".
Alliteration is the repetition of a particular sound in the beginning of a series of words or phrases. Many tongue twisters use alliteration. Watch this cartoon clip and see if you can hear the repetition of consonant sounds.