階

1. noun, suffix storey; story; floor
2. noun stairs
3. noun, suffix stage (in chronostratigraphy)
4. counter counter for storeys and floors of a building

しな also 品 · 科

1. noun, esp. 品 article; item; thing; goods; stock
2. quality
3. usually in kana, esp. 科 flirtatiousness; coquetry

きざはし · きだはし · はし also 段階

1. noun, はし refers to the stairs leading from a building to a garden stairs
2. stairs at the front of a noh stage