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A boggart is a creature in English folklore, either a household spirit or a malevolent genius loci inhabiting fields, marshes, or other topographical features. Other names of this group include bug, bugbear, bugaboo or bug-a-boo, bogey, bogun, bogeyman, bogle, etc., presumably all derived from Old English pūcel, and related to the Irish púca and the pwca or bwga of Welsh mythology.