We can build lots of other words on each of these bases, like doubtful and doubtless, or doublet, and redouble, and doubloon.
Wiele wyrazów da się stworzyć na podstawie tych dwóch: "Doubtful", [niepewny] "Doubtless",  [bez wątpienia] czy też "doublet", [kaftan] "redouble" [podwoić] i "doubloon". [dublon]