A fungus is any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms known as mushrooms. A mushroom is the fleshy, spore-bearing fruiting body of a fungus, typically produced above ground on soil or on its food source. I think mushroom is one of the fungus. can be eaten.

Interestingly, the word fungus comes directly from Latin fungus that literally means mushrooms, and in turn comes from Greek sponge. Fungi are a separate class of microorganisms that reproduce from spores, and are thus different from plants that require photosynthesis to make food for themselves. Fungi consist of molds, yeast, mildew, and mushrooms. It can be unicellular or multi cellular. Mushrooms are fruiting bodies of some kinds of fungi, and most common or famous of these are those that have a button like structure with a stem. Mushrooms are both edible as well as non edible or poisonous.

Mushrooms are a specific type of fungus. Toadstools are also a type of fungus. (fungi is the plural of fungus). There are many different types of fungus.