1. (noun) a ghostly appearing figure

• apparition
• fantasm
• phantasm
• phantom
• specter
• spectre

2. (noun) something existing in perception only

• apparition
• fantasm
• phantasm
• phantom
• shadow

1. (noun) a ghostly appearing figure

• disembodied spirit
• spirit

2. (noun) something existing in perception only

• illusion
• semblance

1. (noun) a ghostly appearing figure

• flying dutchman

2. (noun) something existing in perception only

• flying dutchman
• flying saucer
• ufo
• unidentified flying object
• ghost
• shade
• specter
• spectre
• spook
• wraith

1. (noun) a ghostly appearing figure

• apparitional
• ghostlike
• ghostly
• phantasmal
• spectral
• spiritual

2. (noun) something existing in perception only

• apparitional
• ghostlike
• ghostly
• phantasmal
• spectral
• spiritual
• shadowy
• wraithlike