irony
n. pl. ironies
a. The use of words to express something different from and often opposite to their literal meaning.
b. An expression or utterance marked by a deliberate contrast between apparent and intended meaning.
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sarcasm
n.
a. A cutting, often ironic remark intended to wound.
b. A form of wit that is marked by the use of sarcastic language and is intended to make its victim the butt of contempt or ridicule.