• 階段かいだん — stairs
• 一階いっかい — first floor
• 二階にかい — second floor
• 階級かいきゅう — rank, class
• 階層かいそう — hierarchy, layer
• 階上かいじょう — upper floor

階 combines the hill radical (阝) with the phonetic part 皆 (カイ). Originally related to places on elevated ground, it now mainly expresses levels or steps in both physical and abstract senses.

階段かいだんを 上のぼってください。
Please go up the stairs.

私わたしの部屋へやは 二階にかいにあります。
My room is on the second floor.

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