watchtower

"The school's tower, a tall red and white structure, has antennas for the school's radio broadcasts. "

"The prisoners ate their lunch in the prison cafeteria. "

"The invaders never breached the castle's outer walls, but the defenders knew their last stand would be inside the keeps. "

"The lookout tower provided a good view of the entire school playground. "

"The teacher's observation of the student's progress showed that he was struggling with math. "

"The cold stone walls of the prison had stood for over a century."

"By now, you must surely know which is which."

"The fires in the fireplace kept the cabin warm all night. "

"His charm and good looks accounted for much of his popularity in the polls."

"More people today carry a watch on their wrists than in their pockets."

"He was in trouble when the rain started."

"She scanned the passage carefully but could not find what she was looking for."