There are a number of different synonyms that can be used to describe a watchkeeper, depending on the context in which the word is being used. Some of the most commonly used synonyms for watchkeeper include guard, sentinel, observer, lookout, and monitor. Each of these terms describes someone who is responsible for keeping watch over a particular area or activity, and is often tasked with detecting and reporting any potential threats or issues that may arise. Other synonyms for watchkeeper include custodian, protector, and overseer, all of which suggest a sense of responsibility and vigilance in carrying out this important role.