'Massive genocide'.
Op, you mean omnicide, which is human extinction.
English
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Technically the word you are looking for is populicide. Omnicide literally means the killing of EVERYTHING (hence the Omni-). Everything from books to the world to people. If we wanted to solve the word's problems though we could just commit mundicide and kill the world :P
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[url=http://en.m.wiktionary.org/wiki/omnicide]good try m9[/url]
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[url=http://www.fun-with-words.com/cide_words.html]Knock yourself out[/url]
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We are both at equal power.
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Did we just both commit famicide? Maybe it would be considered logocide