1.  fantasm(n = noun.person) apparition, phantasm, phantasma, phantom, specter, spectre - a ghostly appearing figure; "we were unprepared for the apparition that confronted us"
is a kind of disembodied spirit, spirit
has particulars: flying dutchman

2.  fantasm(n = noun.cognition) apparition, phantasm, phantasma, phantom, shadow - something existing in perception only; "a ghostly apparition at midnight"
is a kind of illusion, semblance
has particulars: flying saucer, ufo, unidentified flying object, flying dutchman, ghost, shade, specter, spectre, spook, wraith

   Same as Phantasm. [1913 Webster]