Passage arm is a term that refers to the section of a building or a structure that connects different areas or rooms. There are several synonyms for the phrase "passage arm," and using them can help to diversify your writing and avoid repetition. Some of the synonyms for passage arm include corridor, hallway, gallery, walkway, aisle, and passage. A corridor refers to a long passage in a building with rooms on either side, while a hallway is a narrow passage that leads to different rooms. A gallery is a long passage with an open side, while a walkway is a pathway for walking. An aisle is a narrow area between rows of seats, while a passage refers to a way through a building or a narrow area.