MGB Roadster is the common use of the term Roadster.
Which is especially strange as the MGB is a drop-heap coupe.
Cutaway doors, no windows, separate hood = roadster
Full-height doors, wind-up windows, integrated hood = DHC
The essential difference is that a roadster has a fabric hood that can be erected if needed, whereas a DHC has a fabric roof that can be lowered when desired.
