Re "soda": I grew up in Central MA and we say soda here. However, my maternal grandparents (Eastern MA born and bred) call it tonic, but i think it may just be archaic from their heyday.
Re "pocketbook": We call it that here, too. I guess when you really think about it it doesn't make much sense, but what you gonna do?
As for me, I don't like the word "pithy." It just sounds like someone with a terrible lisp attempting to say "pissy."
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia