Alex said:
Tom, Peter, thanks you both for your explanation, I now understand the difference better. It still seems like the exact same thing to me, but apparantly the material you do it on is important and I didn't know that.
Alex,
This may clarify (or make less clear) the distinction.
For me, coping involves 'joinery' in a sense.
When I cope I'm joining 2 similar parts... 2 pieces of crown (or baseboard, etc.), a stile and rail, etc.
Specific to moldings, I was taught coping can provide a superior to joint to (even perfect) miters on an outside corner.
Scribing is fitting 2 'dissimilar' pieces... a cabinet base to a floor, a door casing to a wall, etc.
Hope this helps.
Dave