cestode vs echinococcus

cestode and echinococcus both are nouns.

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

As nouns, echinococcus is a hyponym of cestode; that is, echinococcus is a word with a more specific, narrower meaning than cestode:

cestode: ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates
echinococcus: tapeworms whose larvae are parasitic in humans and domestic animals

Other hyponyms of cestode include taenia.

cestode (noun)	echinococcus (noun)
ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates	tapeworms whose larvae are parasitic in humans and domestic animals