Example - My pillow is smooth as silk.
The "as" that I highlighted is the simile there.
Example - It is raining cats and dogs.
Actual meaning - It is raining a large amount
Example - Alice's aunt ate apples and acorns around August
Example - Stars are fire.
Example - When I spilt water it made the sound splash!
The splash that I highlighted is the Onomatopoeia.
Example - He was so tired that the sweat he had made a pool of sweat.
Example - When I was trying to get the cupcake it said "Don't eat me!".
Cupcakes can't talk so if it says don't eat me that is a Personification.