What are microorganisms commonly referred to as?

Microorganisms are commonly referred to as "germs" because this term encompasses a widespread range of microscopic organisms that can cause disease, including bacteria, viruses, fungi, and protozoa. The term "germs" is often used in everyday language to express the idea of harmful microorganisms that can lead to infections and illnesses. This colloquial use highlights the concern that many people have regarding the health risks posed by these tiny entities.

While other terms given refer to specific types or categories of microorganisms—such as viruses, which are just one type of germ, or nonpathogens, which are organisms that do not typically cause disease, and filaments, which relate to certain structures in certain types of organisms—the term "germs" captures the general understanding of microorganisms that are pathogenic or capable of causing illness.