To annihilate something means to destroy it completely.
There are lots of ways of annihilating the planet. [VERB noun]
The Army was annihilated. [be VERB-ed]
Synonyms: destroy, abolish, wipe out, erase
annihilation (ənaɪɪleɪʃən ) uncountable noun ...the threat of nuclear war and annihilation of the human race. [+ of]
Synonyms: destruction, wiping out, abolition, extinction