A lookout tower is a structure commonly used for observing and surveying an area for security or protection purposes. Some of the synonyms for lookout tower are observation tower, watchtower, vantage point, observation post, sentry box, and look post. These synonyms are often used interchangeably, depending on the context of their usage. Observation tower connotes a high structure located in a strategic area while a watchtower is commonly used in fortifications or prisons. Vantage point suggests a position that offers a clear view of surroundings, and observation post implies a temporary structure used for scientific research. Sentry box is a small enclosed structure often used in military settings, and look post is a small tower used for scouting operations. Whatever its name, a lookout tower serves the same important function - surveillance and reconnaissance.