destroyer:
(plural: ‘destroyers‘)
a person who destroys – causes damage to things, especially the ecosystem and environment, and spoils others’ plans, etc.,

a destroyer, breaking up things
e.g.
The Mongol warrior, Genghis khan the Destroyer, was noted for his ruthless war strategies.
If one considers the point seriously, it is obvious that every scientist with a scientific invention is a destroyer of something or the other!
People who encourage or support wars are the number one destroyers of our planet because a war not only destroys our communities but also destroys our environment.
For an article on destroyers, please click here, for an article that accuses US Military for being No.1 destroyer of environment, please click here, for an article on Genghis Khan the destroyer, please click here.

the destroyer of environment -- plastic bags
Note: Animals and things that cause damage or pollute a place or some clean and fresh situation, or a plan, a policy or even an invention that spoils something or causes damage to something clean and clear and healthy can also be called ‘destroyers’. e.g. Dumping radio active waste material in the oceans is one of the major destroyers of the delicate oceanic world. For an interesting article on plastic bags being the biggest destroyer, please click here, and for an article that explains how a city can be a destroyer, please click here.

a Navy destroyer, a warship
A more common meaning is a type of small but fast warship, equipped with all the ultra modern gadgets — radars, sonars, GPS, night-vision cameras, and, more importantly, with high-tech heavy powered weapons that can destroy any enemy approaching from any direction. For an article that describes a Navy destroyer, please click here.
