顶层

顶层	dǐng céng	top floor / the top of a building
顶	dǐng	apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc
层	céng	to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers