Word of the Day - Phantasm

phantasm

/ˈfantaz(ə)m/
noun
literary
1 An illusion, apparition, or ghost.
1.1 archaic An illusory likeness of something.

Origin
Middle English (in the sense ‘deceptive appearance’): from Old French
fantasme, via Latin from Greek phantasma, from phantazein ‘make
visible’, from phainein ‘to show’. The change from f- to ph- in the 16th
century was influenced by the Latin spelling.

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Is it somewhat odd that the "Holy Ghost" isn't typically treated as a phantasm?