楼閣|ろうかくroukaku[0]heiban (flat)

1. nounmultistoried building; castle; palace; shrine
   君きみの計画けいかくは砂上さじょうの楼閣ろうかくに過すぎないよ。↗

   Your scheme is like a house built on the sand.

• Synonym高閣こうかくWrittenA tall, imposing building; also a shelf set high up. Written/formal prose, and not often used.
• Synonym楼観ろうかんWrittenA tall building or watchtower for looking out from; written/formal prose, with the emphasis on the lookout function.
• Synonym楼ろうNeutralA tall building or watchtower; also a suffix in shop names, as in 「〜楼」. Neutral, but rarely used on its own.

Use 「楼閣」 for a splendid multistoried building; it appears in 「砂上の楼閣」, a metaphor for something with no solid foundation that cannot last. In written prose 「高閣」 is the choice, 「楼観」 for a watchtower, and 「〜楼」 as a suffix in shop names.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 重層じゅうそうの立派りっぱな建物たてもの。