trematode worm vs platyhelminth

trematode worm and platyhelminth both are nouns.

Word	Noun	Adjective	Verb	Adverb
trematode worm	Yes	No	No	No
platyhelminth	Yes	No	No	No

As nouns, platyhelminth is a hypernym of trematode worm; that is, platyhelminth is a word with a broader meaning than trematode worm:

trematode worm: parasitic flatworms having external suckers for attaching to a host
platyhelminth: parasitic or free-living worms having a flattened body

Other hypernyms of trematode worm include flatworm.

trematode worm (noun)	platyhelminth (noun)
parasitic flatworms having external suckers for attaching to a host	parasitic or free-living worms having a flattened body