feud > hatred
4 Enrolled in flames, and smouldering dreariment,
dreariment > gloom
5 Through riven clouds and molten firmament; 6 The fierce three-forked engine, making way,
engine > engine of destruction, missile
7 Both lofty towers and highest trees has rent,
rent > torn, split asunder
8 And all that might its angry passage stay;
stay > hinder
9 And, shooting in the earth, casts up a mount of clay.