Territorialism is the practice of protecting and defending one's territory or geographical boundary. There are several synonyms to this word, which include possessiveness, protectiveness, land-grabbing, turf war, and space guarding. These words signify a sense of ownership or control over a particular area or space and a willingness to defend it from intruders. With this in mind, it is crucial to note that territorialism does not necessarily mean aggression, but rather a natural inclination to protect what one considers their own. In summary, the various synonyms for territorialism convey the same idea of protecting and guarding one's territory.