The term "Weird Sisters" refers to the magical trio of witches from William Shakespeare's play "Macbeth." If you're in need of alternative words to describe these spooky ladies, there are several options to consider. Some possibilities might include "mystical maidens," "enchanting enchantresses," or "supernatural sirens." Other options to consider could be "spell-casting sorceresses," "mystifying muses," or "bewitching brood." Ultimately, the choice of a synonym will depend on the tone and context of the writing, as well as personal preference.