Components
潤滑 is an exact match with the following word:
潤滑
BOOST
Reading : じゅんかつ   
smoothness; lubrication
My mastery:
My current mastery of 潤滑:
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Usefulness and usage:
Kanshudo usefulness level: 10 (among the 100,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 38,624 which gives a rank of 44,813
• Google Japan frequency rank: 23,000 (about 28,300,000 results)
• Wikipedia most common 20000 words rank: 16497
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Example sentences:
きかい
機械
じゅんかつ
潤滑
さどう
作動
には
しつど
湿度
かんけい
関係
する

Humidity also contributes to the smooth operation of the machine.
ジュン   うるお to moisten, to wet; to benefit, to profit   うるお to be wet   うる to be moist, be dull   
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ジュン   うるう extra, intercalation (= insertion of extra into something, eg leap year)   
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オウ    king   
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イチ   イツ   ひと    ひと- one   
ド   ト   ground; earth   つち ground, earth, soil   
モン   かど gate   
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スイ   みず water   
カツ   コツ   すべ to slide   なめらか smooth   
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コツ   ほね bone   
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gossip; dishonest   
ニク body part   
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