Components
開く is an exact match with one form of the following word:
開く
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Reading : あく   
'ku' godan verb, intransitive verb
1. to open (e.g. doors)  (esp. 開く)
2. to open (e.g. business, etc.)  (esp. 開く)
3. to be empty  (esp. 空く)
4. to be vacant; to be available; to be free  (esp. 空く)
5. to be open (e.g. neckline, etc.)  (esp. 明く)
6. to have been opened (of one's eyes, mouth, etc.)  (esp. 明く)
7. to come to an end  (esp. 明く)
'ku' godan verb, transitive verb
8. to open (one's eyes, mouth, etc.)  (esp. 明く)
'ku' godan verb, intransitive verb
9. to have a hole; to form a gap; to have an interval (between events)  (see also: 穴が開く)
My mastery:
My current mastery of 開く:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 2 (among the 1,500 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 143,483 which gives a rank of 1,577
開く is the most useful form. 3 additional forms are shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 70% of the time
• Google Japan frequency rank: 7,000 (about 120,000,000 results)
• This form appears in Wikipedia's list of JLPT N5 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 404 (see iKnow! collections)
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Example sentences:
その
はな
ひら
きかけている

The flower is opening.
そのドア
ひら
いている
ことある
The door is sometimes open.
このドア
かない

This door won't open.
あく
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 16,000 (about 41,300,000 results)
• Wikipedia most common 20000 words rank: 10512
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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空く
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Reading : あく   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 79,000 (about 3,470,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 1336 (see iKnow! collections)
• Routledge most useful 5000 words rank: 2082
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form is used as an example of an official Joyo kanji reading
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明く
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Reading : あく   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 37,000 (about 14,900,000 results)
• This form is used as an example of an official Joyo kanji reading
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カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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start, initiate   
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イチ   イツ   ひと    ひと- one   
twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
モン   かど gate   
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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   
メイ   ミョウ   あかり light   あかるい bright   あかるむ to brighten   あからむ to become luminous (at dawn)   あきらか obvious   あかす to lay bare   あ to open   あける to empty   
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ニチ   ジツ   sun; day   ひ    -か    
ガツ   ゲツ   つき month; moon   
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