Croakumshire. n. a croaking sound peculiar to the Northumberland dialect resulting from a supposed inability to sound the letter R. (British)
Cuggermugger. n. whispered gossiping.
Dvandva. n. a compound word, neither element of which is subordinated to the other, as bitter-sweet (Anglo-Saxon)
Sackbut. n. ancestor of the trombone.
Sockdolager. n. 1. a telling blow. 2. something unusually large or imposing.