phantom

As a noun phantom

is something apparently seen, heard, or sensed, but having no physical reality; a ghost or apparition; something elusive or delusive.

As an adjective phantom

is illusive.

As a proper noun Phantom

is nickname of the F-4B jet fighter flown by Marines in Vietnam.

As an adverb phantomwise is

in the manner of a phantom; ghostlily.

As a proper noun phantom

is nickname of the f-4b jet fighter flown by marines in vietnam.

As an adjective phantomlike is

like a phantom; ghostly.

As a proper noun phantom

is nickname of the f-4b jet fighter flown by marines in vietnam.

As a noun idolum is

an insubstantial image; a spectre or phantom.