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Both of two things. Not just one side, but a word that refers to both of them.
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N5料理りょうり
cooking. To make food. Also, the completed food itself.
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N5旅行りょこう
travel. To go to another place and enjoy oneself.
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N1類推るいすい
Inferring something unknown based on similar examples or known facts. Used in contexts involving logical reasoning, as in 「過去の例から類推する」 or 「類推によって結論を導く」.
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N4留守るす
Not being at home, or being away from home.
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N1流布るふ
Spreading widely and circulating throughout society. Used when rumors, information, or ideas become known to many people. Used in expressions such as 「噂が流布する」 or 「誤った情報が流布している」. The character 「流」 is read here as the short 「ル」, not 「リュウ」.
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N5冷蔵庫れいぞうこ
refrigerator. A device that keeps food cold so it doesn't spoil easily.
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N4冷房れいぼう
To cool a room, and the machine for it. The antonym is「暖房（だんぼう）」(heating).
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N2〜N4歴史れきし
The flow of events from long ago to now.
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N1歴然れきぜん
A state in which the existence of something or the difference between things is so clear that anyone can see it. Used for objective facts, differences, or evidence, not for emotions or subjective judgments. Used in expressions such as 「歴然たる事実」, 「実力差が歴然となる」, or 「歴然と現れる」.
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N5練習れんしゅう
practice. To do something repeatedly in order to become skilled at it.
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N3, N4連絡れんらく
To inform someone by phone, letter, etc.
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N1狼藉ろうぜき
Violent and unmannerly behavior, or a state of things being scattered in disarray. Originally referred to the appearance of things scattered like the traces left by a wolf trampling grass, and from there extended to mean violent conduct. Used in expressions such as 「狼藉を働く」 or 「無礼狼藉」.
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N1狼狽ろうばい
Losing one's composure and becoming flustered due to an unexpected event. Used in contexts of being shaken or thrown off balance, as in 「突然の連絡に狼狽する」 or 「狼狽した様子を見せる」. A formal, written-style word.
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N1濾過ろか
Passing liquids or gases through a mesh, paper, cloth, or similar material to remove impurities or solids. Used widely in scientific, industrial, and everyday contexts, as in 「水を濾過する」 or 「コーヒーを濾過する」.
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N5六月ろくがつ
The 6th month of the year.
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N1露骨ろこつ
Showing emotions or intentions openly and without concealment. Often used for emotions that are normally better kept hidden, such as criticism, disgust, or desire. Used in expressions such as 「露骨な表現」 or 「露骨に嫌な顔をする」. The word comes from the image of something so exposed that even the 「骨」 (bones) are laid bare.
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N2, N5若いわかい
young. Having few years.
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N2, N4沸かすわかす
To make water, etc., hot. Example:「お湯を沸かす」(to boil water). The paired word is「沸く（わく）」(to boil).
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N3, N5分かるわかる
understand. For meaning or content to enter one's mind.
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N3, N4別れるわかれる
To part from a person one was with.
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N4沸くわく
For water, etc., to become hot. Example:「お湯が沸く」(water boils). The paired word is「沸かす（わかす）」(to boil).
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N4訳わけ
The reason why something turned out as it did. Used as in 『会社をやめたわけを話す』 ("to tell the reason one left the company"). In the meaning of "reason," it is usually written in kana as 『わけ』. When the same character is read 『やく』, it becomes a separate word meaning to render words into another country's language (such as interpreting).
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N4忘れ物わすれもの
A thing left behind by mistake.
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N2, N5忘れるわすれる
forget. For something one remembered to leave one's mind. The antonym is 「覚える」 (to remember).
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N5私わたし
I. A word referring to the person speaking.
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N2, N5渡すわたす
hand over. To move something from oneself to the other person.
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N2, N5渡るわたる
cross. To move from this side to the other side, such as of a road or river.
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N4笑うわらう
To express happiness or amusement through one's voice or face. The antonym is「泣く（なく）」(to cry).
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N4割合わりあい
The proportion that a part occupies within the whole. Used as in 「三人に一人の割合で車をもっている」 (one in three people owns a car), 「男女の割合」 (the ratio of men to women). Adding 「に」 gives 「割合に」, which no longer refers to a ratio but means "more ... than expected," as in 「割合にやさしい問題だった」 (it was an easier question than expected). In spoken Japanese, however, 「割と」 is used far more often.
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N4, N5悪いわるい
bad. Not being good. The antonym is 「良い」 (good).
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N1, N2, N4割れるわれる
For a hard object to be broken and separated by force. Example: 「ガラスが割れる」 (glass shatters).