2 English words descend from Proto-Germanic *buzdô, most common first.
bugAn insect of the order Hemiptera (the “true bugs”).
boltA (usually) metal fastener consisting of a cylindrical body that is threaded, with a larger head on one end. It can be inserted into an unthreaded hole up to the head, with a nut then threaded on the other end; a heavy machine screw.