Undead - A

Amateur Ghost Hunters = Resurrectionists cross paths with AGH's frequently and many members of the Order may hunt for ghosts as a hobby. 
Annual Haunting = Just what it sounds like.
Artificial Revenants = Scientific attempts to cheat Death have frequently produced Artificial Revenants (technically, Frankenstein's Monster is an Artificial Revenant). For a great example that fits within the Resurrectionist paradigm, see the Revivalist series of novels.
Avatar of Death = A splinter of the cosmic being that is Death itself, the Avatar of Death appears frequently to members of the Resurrectionist Order. For more info see Avatar of Death. 
Avenging Ghosts = These Ghosts were murdered or died unjustly and have now returned from the grave, ostensibly to solve their own death and bring their killers to justice.