They're in Macbeth and Richard III (6)

I believe the answer is:

ghosts

(Other definitions for ghosts that I've seen before include "Spectres, wraiths" , "Apparitions of a dead people" , "Writes for another; Ibsen play" , "Spooks, spectres" , "Spirits or apparitions" .)

I've seen this clue in the Newsday.

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