An Idiom is something that does not mean what it says. You have to figure it out to know the meaning.
The cat got his tongue
Alliteration is where all the words in the sentence all begin with the same letter.
Peter Piper picked a peck of pickled peppers
Similes and Metaphors
Similes and Metaphors are very similar. Similes compare two things using 'like' or 'as'.
My dog is as smelly as dirty socks
But metaphors are comparing two things WITHOUT using 'like' or 'as'
Her laughter is a gentle song
Onomatopoeia are words that mean a sound
Crunch! Bang! Whizz! Pow!
Hyperboles are when you exaggerate.
If I get this multiplication problem wrong, The earth will open up a big hole and an evil hand will grab me and suck me into the darkness.
Personification is when you give human traits to non-human things
When I reached out my hand to grab the pizza, it ran away at 345674653463.7km/h