Pariah is someone who is disliked and rejected by other people: “He is so snobbish and stiff-necked that he has become a pariah in the whole locality and nobody wants to befriend him.”
Piranha on the other hand, means any of several tropical South American freshwater fish that are voraciously carnivorous and often attack and destroy living animals: “Piranha is as dangerous a fish as the shark because it also eats up living animals.”
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