Actinomycetous is an adjective used to describe a group of bacteria that form branching filaments. Some synonyms for actinomycetous include filamentous, branched, and mycelial. These terms all refer to the same characteristic of the bacteria and can be used interchangeably in scientific or technical writing. Additionally, terms such as streptomycetes, nocardia, and actinobacteria can all be used as synonyms for actinomycetous as they are different types of bacteria within the same phylum. It's important when using synonyms to ensure that the meaning remains clear and accurate to avoid confusion.