Will-o'-the-wisps, also known as ignis fatuus, ghost lights, or jack-o'-lanterns, are supernatural apparitions that appear as flickering flames or lights in marshy areas. These lights have captured the imaginations of people for centuries, and as a result, they have several synonyms that describe their mysterious nature. Other terms that are commonly used to refer to will-o'-the-wisps include corpse candles, fairy lights, and hinkypunks. Each of these terms has its own unique origin and connotations, but they all share the same sense of mystery and intrigue that makes will-o'-the-wisps such a fascinating subject of folklore and legend.