Idiom
Two things getting compared with like or as
Dramatic Irony
When the audience knows something the character does not
Verbal irony
similar to sarcasm, when the writer makes a statement in which the actual meaning differentiates between what the character is saying / what the words appear to express
Situational Irony
when the audience is led to believe in one thing that will occur when the opposite (or something completely different) actually occurs. either humorous or tragic