Components
害する is an exact match with the following word:
害する
BOOST
Reading : がいする   
suru verb - special class, transitive verb
1. to injure; to damage; to harm; to hurt
2. to kill
3. to hinder; to obstruct
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 73,041 which gives a rank of 10,833
• Google Japan frequency rank: 96,000 (about 2,080,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• 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 29 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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Example sentences:
けんこう
健康
がい
する
こと
かね
なくすことより
じゅうだい
重大
である
Loss of health is more serious than loss of money.
その
けんきゅう
研究
きつえん
喫煙
けんこう
健康
がい
する
こと
あき
らか
した
The study made it clear that smoking ruins our health.
かれ
かんじょう
感情
がい
しない
しんぱい
心配
した

We were afraid that we might hurt him.
ガイ    damaged, injured   
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コウ   ク   くち mouth   
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シュ   ぬし    あるじ master, proprietor, owner   
roof   
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