• 楼閣ろうかく — multistory pavilion; elegant tower
• 鐘楼しょうろう — bell tower at a temple
• 高楼こうろう — tall building; lofty tower (literary)
• 城楼じょうろう — tower of a castle
• 楼上ろうじょう — upper floor; upstairs (literary)

On the left, the radical 木 shows a structure made from wood. The right side adds the sound ロウ and suggests something rising high above ground level. Together, 楼 evokes a tall wooden tower or pavilion, the kind of building that stands out in a castle town or temple complex.