Bacterioid can be substituted with several synonyms depending on the context of usage. Some synonyms include bacterial, bacillary, germinal, microbic, microbial, and pathogenic. Bacterial refers to any type of organism that belongs to the domain Bacteria, bacillary refers to any rod-shaped bacteria, and germinal refers to any substance that promotes the growth of bacteria. Microbic is an adjective used to describe anything related to microorganisms, including bacteria. Pathogenic, on the other hand, is a term used to describe bacteria that can cause disease in humans or animals. By using these synonyms, one can effectively describe various aspects of bacteria and their impact on the environment.