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A substance that kills cells is known as a toxin. There are toxins in the foods and beverages that are consumed everyday.
a substance the kills fungi
poisin
An arachnicide is a substance which kills arachnids.
Antibiotic's
An aphidicide is a substance which kills aphids.
An antibacterial or a bacteriocidic substance kills bacteria.
A pediculocide kills lice. It is a class of insecticides.
parasite
Alcohol
i think poison
An acaricide is a substance which kills acarids - mites and ticks.