くうかん
space, room
Empty gap with nothing in it at all. The same coo くう as 空気 and the same Khan かん, until somebody puts a great deal of furniture into a very small one: くうかん.
部屋 へや is a room with walls. 空間 is the space itself, and 余裕 よゆう is room as spare capacity.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.