Quenya 

fairë

phantom, disembodied spirit, when seen as a pale shape

fairë(1) noun "phantom, disembodied spirit, when seen as a pale shape" (pl. fairi in Markirya); compare ausa. The noun fairë was also used = "spirit (in general)", as a kind of being (MR:349, PE17:124). In VT43:37 and VT44:17, fairë refers to the Holy Spirit (fairë aista or Aina Fairë)