Components
空 is an exact match with the following word:
BOOST
Reading : くう   
noun
1. empty air; sky
2. shunya (emptiness, the lack of an immutable intrinsic nature within any phemomenon)  (Buddhist term)
3. air force  (see also: 空軍; abbreviation)
4. fruitlessness; meaninglessness
5. void (one of the five elements)  (see also: 五大)
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My current mastery of 空:
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Usefulness and usage:
Kanshudo usefulness level: 9 (among the 50,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 40,772 which gives a rank of 41,336
• Google Japan frequency rank: 2,000 (about 642,000,000 results)
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No examples found for any form of this word.
クウ   から empty   あ to be empty   あける to empty, vacate   そら sky   
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コウ   ク    work; construction; craft   
ケツ   あな hole   
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katakana 'ha'; eight
roof   
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