Meaning : Witty language used to convey insults or scorn.
Example :
He used sarcasm to upset his opponent.
Irony is wasted on the stupid.
Satire is a sort of glass, wherein beholders do generally discover everybody's face but their own.
Synonyms : caustic remark, sarcasm, satire
Meaning : Incongruity between what might be expected and what actually occurs.
Example :
The irony of Ireland's copying the nation she most hated.
Meaning : A trope that involves incongruity between what is expected and what occurs.