ligan vs wreckage

ligan and wreckage both are nouns.

Word	Noun	Adjective	Verb	Adverb
ligan	Yes	No	No	No
wreckage	Yes	No	No	No

As nouns, wreckage is a hypernym of ligan; that is, wreckage is a word with a broader meaning than ligan:

ligan: goods (or wreckage) on the sea bed that is attached to a buoy so that it can be recovered
wreckage: the remaining parts of something that has been wrecked

ligan (noun)	wreckage (noun)
goods (or wreckage) on the sea bed that is attached to a buoy so that it can be recovered	the remaining parts of something that has been wrecked