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空 means 'empty'

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Strokes : 8    Frequency: 253   JLPT: N4    Usefulness: 2    Study set: 2-5    Grade: 1   Intermediate lesson: 10    Beginner lesson: -   Begins 390 words   Used in 659 words   Used in 974 names   Component in 15 kanji (1 Jōyō)
Jōyō (常用)
Common readings
On
   クウ
Kun
   から empty   あく to be empty   あける to empty, vacate   そら sky
Additional readings
Kun    すく to become empty, to get hungry   すかせる to get hungry   あき   すかす   むなしい
Name    うつ   き   く
Components
⿱  穴 hole  工 work  
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Most useful words by reading
In the most useful 10,000 words in Japanese, 空 is used 28 times, read 5 ways (with 1 variation).
Across all words in Japanese, 空 is used 645 times, read 7 ways (with 2 variations).
Showing:
クウ : 442 words FIND ALL
く う こ う 0
noun
airport
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そら : 62 words FIND ALL
そ ら 1
noun
1. sky; the air; the heavens
2. weather
(click the word to view an additional 6 meanings and 2 forms, examples and links)
から : 55 words FIND ALL
か ら 2
Most common form: から
emptiness; vacuum; blank
(click the word for examples and links)
あく : 27 words FIND ALL
あ き 0
Most common form: あき
noun
1. space; room; emptiness; gap
2. opening; vacancy; empty seat
(click the word to view an additional 2 meanings and 2 forms, examples and links)
そら (read as ぞら) : 18 words FIND ALL
あ お ぞ ら 3
noun
blue sky
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すく : 13 words FIND ALL
す く 0
Most common form: すく
'ku' godan verb, intransitive verb
1. to become less crowded; to thin out; to get empty
2. to be hungry  (see also: お腹が空く)
(click the word for examples and links)
むなしい : 7 words FIND ALL
む な し い 3 む な し い 0
Most common form: 虚しい
1. empty; void; vacant
2. vain; fruitless; futile; ineffective
(click the word to view an additional 1 meaning and 2 forms, examples and links)
あき (read as あき) : 5 words FIND ALL
あ き ま 0
vacancy; room for rent or lease
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うつ: 16 words. FIND ALL
う つ け 0
noun
absentmindedness; dreaminess; simpleton; fool
(click the word to view an additional 1 form, examples and links)
An additional あ.ける less common words include 空 but the reading has not yet been categorized.
Quick links
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More information
Wiktionary ⇗ | Unicode.org ⇗ | Google Japan ⇗ | Hanziyuan etymology ⇗
Additional data
Henshall: 66 (originally: 15)  Joy o' Kanji : 15  Key to Kanji: 239 

Cascading kanji view

空
クウ   から empty   あく to be empty   あける to empty, vacate   そら sky   
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工
コウ   ク    work; construction; craft   
穴
ケツ   あな hole   
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ハ
katakana 'ha'; eight
宀
roof   
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