Components
無くす is an exact match with one form of the following word:
なくす
BOOST
'su' godan verb, transitive verb
1. to lose something  (often written with kana only)
2. to get rid of  (usu. 無くす; often written with kana only)
3. to lose someone (wife, child, etc.)  (this meaning is restricted to form 亡くす)
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My current mastery of なくす:
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Usefulness and usage:
Kanshudo usefulness level: 3 (among the 3,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 137,001 which gives a rank of 1,907
なくす 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 60% of the time
• Google Japan frequency rank: 40,000 (about 13,500,000 results)
• Wikipedia most common 20000 words rank: 11816
• One of the 1240 words included in the Genki textbooks
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
わたし
その
ぜんじつ
前日
カメラなくしてしまった
I had lost a camera in the previous day.
わたし
まえ
った
とけい
時計
なくした
I lost the watch I had bought the day before.
りた
ほん
なくしてしまいました
I lost the book you lent me.
無くす
BOOST
Reading : なくす   
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 72,000 (about 4,300,000 results)
• This form appears in Wikipedia's list of JLPT N5 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 760 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 18243
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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亡くす
BOOST
Reading : なくす   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 189,000 (about 344,000 results)
• This form appears in Wikipedia's list of JLPT N2 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 4148 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 8865
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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失くす
BOOST
Reading : なくす   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 86,000 (about 2,800,000 results)
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ム   ブ   な not   
ボウ   モウ   dead   な to be deceased, to have ceased to be   
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shelf
lid
シツ   うしな to lose   
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シ   や arrow   
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ダイ   タイ   おおきい big   おおいに very much   おお-    
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イチ   イツ   ひと    ひと- one   
ジン   ニン   ひと person   
ジン   ニン   ひと man   
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