空

sky, empty, void, vacant, vacuum

Kun

そら · あく · あき · あける · から · すく · すかす · むなしいsora · aku · aki · akeru · kara · suku · sukasu · munashiie.g.空そらsky

On

クウkuue.g.空港くうこうairport

Kun is the Japanese reading, used when the kanji stands alone with kana after it. On comes from Chinese and is mostly used in compound words.

Radical

穴cave

Parts

穴cave工work儿legs宀roof