Is there a difference between a flop and a lob?
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A lob is just hitting a shot with a high arc using a normal pitching stroke.
A flop actually involves flipping the clubhead under the ball ahead of the hands, thus adding loft. It's a shot which takes practice, but when done right the ball can be hit almost straight up with an open 60° wedge. It's usually a good idea to have a low bounce wedge when trying this shot, especially if the lie is even a little bit tight. I would almost never try it from a fairway lie... too easy to just skull the ball over the green. I've caught it thin and hit the ball 50 yards when trying to hit it 10 yards. There is very little room for error because you are swinging very hard for a short distance. When done right, the ball lands dead, with very little spin.
I did a short game trajectory video here, a flop would be on the "high, high" end of the spectrum
Like Erik said a flop is just a higher lob.