One of the great memes to emerge from Star Trek is Dr. McCoy's oft repeated admonishment when he was asked to perform some miracle: "I'm a doctor, not a BLANK". There are six instances when McCoy used that line in the original series (once it was "I'm a surgeon, not a BLANK). Give ANY one of the words that McCoy used to fill in the blank. All of them, save one, are professions (one of them is actually a medical specialty), while the other was a mechanical conveyance that was never seen in use on the show. One job you have to think likely didn't exist in 's time, but still exists in Wyoming, West Virginia, western Pennsylvania, southern Illinois, and parts of Kentucky.
bricklayer, psychiatrist, escalator, mechanic, engineer, coal miner