cestode vs platyhelminth

cestode and platyhelminth both are nouns.

Word	Noun	Adjective	Verb	Adverb
cestode	Yes	No	No	No
platyhelminth	Yes	No	No	No

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

cestode: ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates
platyhelminth: parasitic or free-living worms having a flattened body

Other hypernyms of cestode include flatworm.

cestode (noun)	platyhelminth (noun)
ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates	parasitic or free-living worms having a flattened body