accident vs wreck

accident and wreck both are nouns.

Word	Noun	Adjective	Verb	Adverb
accident	Yes	No	No	No
wreck	Yes	No	Yes	No

As nouns, wreck is a hyponym of accident; that is, wreck is a word with a more specific, narrower meaning than accident:

Other hyponyms of accident include collision, crash, accidental injury, injury, shipwreck, casualty, fatal accident.

accident (noun)	wreck (noun)
anything that happens suddenly or by chance without an apparent cause	a ship that has been destroyed at sea
an unfortunate mishap; especially one causing damage or injury	a serious accident (usually involving one or more vehicles)
	an accident that destroys a ship at sea
	something or someone that has suffered ruin or dilapidation

accident (verb)	wreck (verb)
	smash or break forcefully