Word two! It’s blunderbuss, which someone had mentioned curiosity about ages ago (sorry! I don’t remember who!).
Blunderbuss has two meanings, one, an insensitive “blundering” person, and two, a musket that can fire at close range. Um, okay. It showed up in the mid seventeenth century from the Dutch donderbus, a mix of donder, thunder, and bus, gun. So a blunderbuss is a thunder gun, first literally and then figuratively. Apparently people started pronouncing donderbus wrong because donder sounded kind of like blunder, which has a totally separate etymology. But weirdly enough, donder survives in English as dunderhead. Well, probably. There are no better guesses as to where “dunder” comes from.