Well, most of the terms mentioned begin with "r".
To get the ball rolling,
refinished, means the bluing and/or straw colors were done again. Removal of the old finish is the wild card here. It might have been dipped for chemical removal only . It might have been media-blasted, which leaves tell-tale evidence of such. Worst case, it was buffed to prep for the new finish, which can range from a light smoothing of the surface to something that is obviously all rounded over corners and edges.
reworked, would mean it had parts replaced, barrel changed, maybe refinished, etc. Done by official/military armorers--or Bubba.
reblued, is the application of a new finish, whether rust blue or hot dip (salt) blue.
refurbished, might include new finish or chasing out the checkered pattern on the grips, generally, I'd think, anything needed to make the gun look or work better.
replaced, We needn't go over this one too much. Parts could be repro or original--but they can never be "original to the gun".
shooters are the guns that are least collectible, distanced from collectible originality by any or all of the above processes, or just plain old wear and tear. This is not to say that they are not
desireable!
I'll add "restored", which is anything necessary to take a gun back to
original-like condition. Restoration might include welding heavy pitting back level, making new grips, and probably refinishing. Once a gun is used, damaged, or messed with in any way, it is no longer original--which would be how it was when it left the factory gates--and there's no turning back after that.