A sentinel; esp., any of the men of a military guard posted to guard against, and warn of, danger
One that watches or observes:
The act or duty of guarding.
Guardian is defined as someone who watches over or protects.
Find another word for watchmen. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for watchmen, like: sentries, sentinels, watchers, guards and guardians.