The word "楼道" is formed by combining the character "楼", which means "building" or "floor", with the character "道", which means "path" or "way". Together, they create a compound where "楼" specifies the location as being within or related to a building, and "道" indicates a passage or corridor, resulting in the meaning "hallway" or "building corridor". This combination directly denotes a pathway inside a building without implying any broader linguistic patterns.