Meaning of words

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SATIRE: 
 the use of humour, irony, exaggeration, or ridicule to expose and criticize people's stupidity or vices, particularly in the context of contemporary politics and other topical issues.
 IRONY:  
the expression of one's meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect.
  SARCASM: 
 the use of irony to mock or convey contempt
CYNICISM: 
an inclination to believe that people are motivated purely by self-interest; skepticism.

        
According to this we can see that IRONY is the lowest level in terms of criticism and SATIRE is on the top of this scale because satire has in itself humor, irony and all other things, that can help in criticizing.