Bio-warfare, or biological warfare, refers to the use of biological agents such as viruses, bacteria, toxins, and fungi as weapons in warfare. However, due to the negative connotations associated with the term, there are alternative synonyms that may be used instead. These synonyms include bioterrorism, germ warfare, biological attack, biowar, bio-aggression, and bio-weaponry. These terms can be used interchangeably with bio-warfare depending on the context of their usage. It is important to note that the use of any such term usually implies an intentional act of aggression to cause harm or casualties by using biological agents for warfare purposes.