Belligerent

Warring party to military conflict

A belligerent is an individual, group, country, or other entity that acts in a hostile manner, such as engaging in combat. The term comes from the Latin bellum gerere. Unlike the use of belligerent as an adjective meaning "aggressive", its use as a noun does not necessarily imply that a belligerent country is an aggressor.

This keyword could refer to multiple things. Here are some suggestions: