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germ a microscopic organism, especially one that causes illness. Bacteria and viruses that cause diseases are called germs. [2 definitions]
host1 a plant or animal that has a parasite living on or in it. A parasite gets its food and energy from the host organism. [1/3 definitions]
parasite a plant, animal, or fungus that lives on or in another living thing, called the host. A parasite gets its food and energy from the host organism.
virus a tiny organism that can reproduce only in living cells. Viruses cause disease in humans, animals, and plants. [2/3 definitions]