Watchguard is a term that refers to a person or device responsible for protecting and monitoring a particular area or property. There are several synonyms for this term, such as security guard, sentinel, lookout, patrol, defender, protector, keeper, and watcher. A security guard is a person employed by a company or organization to protect or secure their assets, while a sentinel is someone watching over a specific area or building. A lookout is someone who keeps watch for potential dangers or threats. A patrol is a group of people who walk around a particular area and protect it. Defenders, protectors, and keepers are responsible for guarding and ensuring the safety of a particular property. Lastly, a watcher is someone who keeps a close eye on a particular area or situation.