Being a lookout is an important job that requires vigilance and alertness. ABET, SENTINEL, SENTRY, and ABETS are all terms related to this job. ABET is a four letter word meaning to encourage or assist someone in doing something wrong. SENTINEL is an eight letter word meaning a guard or watchman who keeps careful watch for possible danger. SENTRY is a six letter word meaning a soldier or guard posted to keep watch at a particular place. ABETS is a five letter word meaning to help or encourage someone to do something wrong.