Genus Corynebacterium is a group of bacteria that includes several species of Gram-positive bacteria commonly found in the environment and as a part of the bacterial flora on the human skin and mucous membranes. This group of bacteria is characterized by a unique rod shape and a high degree of variability in their physiological and biochemical properties. Some synonyms for the genus Corynebacterium include diphtheroids, pseudodiphtheroids, and coryneforms. These terms refer to the resemblance of the bacteria to the causative agent of diphtheria, although most of the Corynebacterium species do not cause disease in humans. Understanding the different synonyms for the genus Corynebacterium can help researchers and medical professionals accurately identify and classify bacterial species.