Definify.com

Webster 1913 Edition

Noun.

One who causes a wreck, as by false lights, and the like.

One who searches fro, or works upon, the wrecks of vessels, etc. Specifically:

(a)

One who visits a wreck for the purpose of plunder.

(b)

One who is employed in saving property or lives from a wrecked vessel, or in saving the vessel;

as, the

wreckers

of Key West

A vessel employed by wreckers.

wrecker ‎(plural wreckers)

A person or company that dismantles old or wrecked vehicles or other items, to reclaim useful parts. (Australia)
One who breaks up situations, events.
home wrecker / marriage wrecker / party wrecker
A tow truck.
A mooncusser.
In the Soviet Union, someone accused of the formal charge of wrecking, that is, undermining the state in intangible ways.

person or company that dismantles old or wrecked vehicles or other items, to reclaim useful parts

one who breaks up situations, events

tow truck — see tow truck

mooncusser