a temporary resident; visitor; guest.

a visitor to a place of religious or sight-seeing interest; pilgrim.

a being believed to come from the spirit world

a ghostly visitant.

something, as a mood, feeling, emotion, etc., that overtakes a person from time to time

Melancholy is an occasional visitant to all.

a migratory bird that has come to a place temporarily.

visiting; paying a visit.

noun

guest , visitor , apparition , bogey , bogeyman , bogle , eidolon , phantasm , phantasma , phantom , revenant , shade , shadow , specter , spirit , wraith