schistosome vs trematode worm

schistosome and trematode worm both are nouns.

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

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

schistosome: flatworms parasitic in the blood vessels of mammals
trematode worm: parasitic flatworms having external suckers for attaching to a host

Other hypernyms of schistosome include fluke, trematode.

schistosome (noun)	trematode worm (noun)
flatworms parasitic in the blood vessels of mammals	parasitic flatworms having external suckers for attaching to a host