Well there are:- Objects called bats - baseball bats, cricket bats etc. Mammals called bats - horseshoe bats, pipestrals, fruit bats etc. Fish called bats - bat fish. Mental conditions called 'bats'...
Bats don't have venom in their teeth, but some bats do have anesthetics and anti-coagulates. These are vampire bats. Their saliva (spit) contains chemicals that numb whatever they're biting and also...