trepang vs sea cucumber

trepang and sea cucumber both are nouns.

Word	Noun	Adjective	Verb	Adverb
trepang	Yes	No	No	No
sea cucumber	Yes	No	No	No

As nouns, sea cucumber is a hypernym of trepang; that is, sea cucumber is a word with a broader meaning than trepang:

trepang: of warm coasts from Australia to Asia; used as food especially by Chinese
sea cucumber: echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders

Other hypernyms of trepang include holothurian.

trepang (noun)	sea cucumber (noun)
of warm coasts from Australia to Asia; used as food especially by Chinese	echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders