Synonyms for ghost

noun

1. An unsubstantial being

   vision, specter, wraith, apparition, spirit, daemon, demon, shade, phantom, appearance, incorporeal being, ethereal being, etheric being, spook, supernatural visitant, phantasm, kelpie, zombie; see also devil 1.

2. A disembodied human soul

   spirit, manes, revenant, shade, soul.

give up the ghost