Components
警戒 is an exact match with one form of the following word:
警戒
BOOST
Reading : けいかい   
1. vigilance; precaution; watch; lookout; alertness
2. to be vigilant; to be cautious; to guard (against)
My mastery:
My current mastery of 警戒:
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My flashcards:
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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 126,779 which gives a rank of 2,853
警戒 is the most useful form. 1 additional form is shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is almost always used
• Google Japan frequency rank: 14,000 (about 49,000,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 4974 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 5495
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 3 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
• This form is used as an example of an official Joyo kanji reading
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Example sentences:
へいしたち
兵士達
けいかい
警戒
ながら
こっきょう
国境
かって
すす
んだ

The soldiers headed for the frontier with caution.
かれ
あらし
けいかい
警戒
していた

They were on the lookout for a storm.
けいかい
警戒
けいび
警備

Forewarned is forearmed.
けいかい
BOOST
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 141,000 (about 636,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 3 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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ケイ   admonish
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ケイ   うやま to respect, revere   
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grass   
ク    verse, phrase   
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wrap
コウ   ク   くち mouth   
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ぼく strike   
ゲン   ゴン   say; word   こと word, saying   い to say   
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イチ   イツ   ひと    ひと- one   
カイ   いましめる to warn, admonish   
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twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
tasseled spear
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