boon(noun): a thing that is helpful or beneficial.

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travail(noun): painful or laborious effort.

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atavism(noun): a reappearance of an earlier characteristic; throwback.

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peruse(verb): read (something), typically in a thorough or careful way.

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clumsy(adjective): awkward and without skill.

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I hope this helps you if you are preparing for GRE exams.