調べる
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A casual word for investigate, or find out about. To look up in a dictionary, to check tomorrow’s weather report. To find out about the blood type of your favorite singer.
$$$
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検査
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Medical checkup, or police investigation, or inspection:(financial audit, smog check, check the condition of goods that roll off the assembly line, etc). Has the nuance of a test where something passes or fails.
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調査
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An investigation. (unlike 検査、調査emphasizes that there are no correct answers, and implies that the investigators are talking to someone, asking questions directly). 調査 is usually used about polls, surveys, and detectives questioning suspects and/or witnesses.
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検討
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A review or inquest (unlike 検査、 検討 means that a panel of experts are discussing the matter among themselves, rather than a superior person interrogating an inferior person).
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診断
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Medical diagnosis (not exam!)
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査定
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A totally useless word for ‘assess.’
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検索
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Internet search
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