Metaphor and Oxymoron
Metaphor
This is a comparison made between two things, without the use of the words ‘as’ or ‘like’.
Examples:
That Jessie James is a snake.
She is a rainbow.
Oxymoron
This exists when contradicting words are used together (one is used to modify the other).
Examples:
Expressions like: original copy; found missing; terribly pleased; small crowd; clearly misunderstood; pretty ugly; great depression
“Did you respond to Marie’s question?” John asked. “Yes,” Joe replied. “I told her it was a definite maybe.”