Fungus is a microscopic substance that exists in the air around us all the time. It is neither plant nor a type of bacteria—it’s a separate type of living organism that occupies its own kingdom of classification.
Mold is one type of fungus. It can measure from two to 10 microns in diameter, making it virtually invisible to the naked eye. When multiple mold spores grow close together they become visible as they spread rapidly across a surface.
Molds are a type of fungus but there are many types of fungi that are not molds . For example, mushrooms are a fungus but they are not a type of mold.
There are many different forms of Fungi, including, but not limited to:
Slime molds and water molds are not fungi