The word "gi's" is a slang term commonly used in the United Kingdom to refer to British military personnel. However, there are a variety of synonyms that can be used instead of this term. Some examples include "squaddie," "tommy," "grunt," "soldier," and "trooper." These words are frequently used in the context of military slang and are widely recognized within military communities. By using alternative synonyms for "gi's," it is possible to add variety and nuance to one's language, while also demonstrating an understanding of the unique terminology and slang associated with the military.