Burj is an Arabic word that means "tower" or "tall building." There are many synonyms for the word burj, including minaret, minar, obelisk, spire, steeple, and tower. Each of these words describes a tall structure that rises above other buildings in the surrounding area. A minaret is a tower attached to a mosque from which the call to prayer is made. A minar is similar but used in a non-Islamic context. An obelisk is a tall, four-sided pillar that has a pointed top. A spire is a tall, pointed structure that is often part of a church or cathedral. A steeple is a tall, pointed structure that sits on top of a church or other building. Finally, a tower is a tall structure that is usually used for observation, defense, or communication purposes.