Many, many interpretations of Woolf’s reference to “Milton’s bogey” in her final paragraph of A Room of One’s Own exist in print. I have read only a small fraction of them, I suspect. But to me, as an unabashed re-reader of J. K. Rowling, the definition in the Oxford English Dictionary of bogey was especially useful in understanding Woolf’s meaning. Bogey means devil, goblin, an object of terror. For centuries, bogey has been spelled as bog, bogy, bogie, boguey, bogle, boggle, boggard. To my mind, it’s a short step from there to boggart.