meaning: sky, empty
空港（クウコウ）: an airport
架空（カクウ）: overhead, aerial; fanciful, imaginary
空（クウ）: the air, space, the void
空（そら）: the sky, the weather
空耳（そらみみ）: mishearing, imagination
空き瓶（あきビン）: an empty bottle
空ける（あける）: to empty, to make room
空（から）: being empty, a state of emptiness
空騒ぎ（からさわぎ）: a big fuss about nothing, a storm in a teacup
#空 is made of 穴 and 工. 穴 is “a hole” and 工 apparently had a meaning of “breaking through” although 工 in the modern Japanese language does not have that meaning.
空 is listed under the radical of #あなかんむり（穴）.
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